The following question was raised in discussions:

Discussed in #286

contract DecentralizedStableCoin is ERC20Burnable, Ownable {
    error DecentralizedStableCoin__MustBeMoreThanZero();
    error DecentralizedStableCoin__BurnAmountExceedsBalance();
    error DecentralizedStableCoin__NotZeroAddress();

    constructor () ERC20 ("DecentralizedStableCoin","DSC") {
    }

constructor () ERC20("DecentralizedStableCoin","DSC") Ownable(0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266){
    }

    constructor(address initialOwner) {
        _transferOwnership(initialOwner);
    }

There was an update to OpenZeppelin's code two months ago that changed from the code that's used in the course, to what's shown above.
Since the update, address of the owner must be entered manually through the constructor parameter.

I suggest noting this change on YouTube, and I'll also note this in the Decentralized coin repo.

Lesson

Lesson 9

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/sas02qSFZ74?t=18743

Operating System

Windows

Describe the bug

I am in Lesson 9. In the following test, I don't get why the test need to "emit RaffleEnter(PLAYER)"?

in test/unit/RaffleTest.s.sol

function testEmitsEventOnEntrance() public {
        // Arrange
        vm.prank(PLAYER);

        // Act / Assert
        vm.expectEmit(true, false, false, false, address(raffle));
        
        emit RaffleEnter(PLAYER); // todo: shuoldn't the next call emit?
        raffle.enterRaffle{value: raffleEntranceFee}();
    }

I ask this because the next call "raffle.enterRaffle{value: raffleEntranceFee}()" will emit the event,
in src/Raffle.sol

    function enterRaffle() public payable {
        // require(msg.value >= i_entranceFee, "Not enough value sent");
        // require(s_raffleState == RaffleState.OPEN, "Raffle is not open");
        if (msg.value < i_entranceFee) {
            revert Raffle__SendMoreToEnterRaffle();
        }
        if (s_raffleState != RaffleState.OPEN) {
            revert Raffle__RaffleNotOpen();
        }
        s_players.push(payable(msg.sender));
        // Emit an event when we update a dynamic array or mapping
        // Named events with the function name reversed
        emit RaffleEnter(msg.sender);
    }

hi i have issu whith this command in my terminal

forge create SimpleStorage --rpc-url http://127.0.0.1:7545
 --interactive

when i want to run this command i got this error:

forge create SimpleStorage --rpc-url http://127.0.0.1:7545
--interactive
[⠢] Compiling...
[⠆] Compiling 1 files with 0.8.19
[⠰] Solc 0.8.19 finished in 81.31ms
Compiler run successful!
Error: 
Error accessing local wallet. Did you set a private key, mnemonic or keystore?
Run `cast send --help` or `forge create --help` and use the corresponding CLI
flag to set your key via:
--private-key, --mnemonic-path, --aws, --interactive, --trezor or --ledger.
Alternatively, if you're using a local node with unlocked accounts,
use the --unlocked flag and either set the `ETH_FROM` environment variable to the address
of the unlocked account you want to use, or provide the --from flag with the address directly.
zsh: command not found: --interactive

how can i fix this? please help

Lesson

Lesson 7

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

No response

Operating System

Windows

Describe the bug

i don't know why it's didn't revert!
here is part of test code:

contract FundMeTest is Test {
    // constructor() {

    // }
    FundMe fundMe;
    address SENDER = makeAddr("jaunepr");
    uint256 constant SEND_VALUE = 1 ether;
    uint256 constant SENDER_BALANCE = 10 ether;

    // uint256 constant FUNDERS_INDEX = 0;

    function setUp() external {
        DeployFundMe deployFundMe = new DeployFundMe();
        fundMe = deployFundMe.run();
        vm.deal(SENDER, SENDER_BALANCE);
    }
    modifier funded() {
        vm.prank(SENDER);
        fundMe.Fund{value: SEND_VALUE}();
        _;
    }

    function testOnlyOwnerCanWithdraw() public funded {
        vm.prank(SENDER);
        vm.expectRevert();
        fundMe.Withdraw();
    }

and i use forge test --match-test testOnlyOwnerCanWithdraw -vvv
then, here is ouput:

[FAIL. Reason: call did not revert as expected] testOnlyOwnerCanWithdraw() (gas: 108176)
Traces:
  [108176] FundMeTest::testOnlyOwnerCanWithdraw()
    ├─ [0] VM::prank(jaunepr: [0xD32aC66b047b3Ba085a452E26814BD4F20A99929])
    │   └─ ← ()
    ├─ [81354] FundMe::Fund{value: 1000000000000000000}()
    │   ├─ [8993] MockV3Aggregator::latestRoundData() [staticcall]
    │   │   └─ ← 1, 200000000000 [2e11], 1, 1, 1
    │   └─ ← ()
    ├─ [0] VM::prank(jaunepr: [0xD32aC66b047b3Ba085a452E26814BD4F20A99929])
    │   └─ ← ()
    ├─ [0] VM::expectRevert(custom error f4844814:)
    │   └─ ← ()
    ├─ [6788] FundMe::Withdraw()
    │   ├─ [0] jaunepr::fallback{value: 1000000000000000000}()
    │   │   └─ ← ()
    │   └─ ← ()
    └─ ← call did not revert as expected

Test result: FAILED. 0 passed; 1 failed; 0 skipped; finished in 1.75ms
 
Ran 1 test suites: 0 tests passed, 1 failed, 0 skipped (1 total tests)

Failing tests:
Encountered 1 failing test in test/FundMeTest.t.sol:FundMeTest
[FAIL. Reason: call did not revert as expected] testOnlyOwnerCanWithdraw() (gas: 108176)

Encountered a total of 1 failing tests, 0 tests succeeded

Describe the enhancement

Our NFTs allow people to add their twitter handle, it would be awesome if we had a bot tweet to someone's handle whenever they minted an NFT!

Here is the contract:
https://arbiscan.io/address/0x39338138414Df90EC67dC2EE046ab78BcD4F56D9#code

Additionally, having a website that shows a real-time list of people minting would be awesome.

I'm down to pay someone to work on this as well!

I am trying to execute a command $ source .env. Also I am in the folder : foundry-simple-storage-f23.Unfortunately it shows: "bash: .env: No such file or directory"
I have checked twice that the .env in the in the Gitignore folder under #Dotenv file
I have saved the .env in the test folder.
May be someone else also have got the same problem? PLease help. Thank you.

mint:
	@forge script script/Interactions.s.sol:MintBasicNft $(NETWORK_ARGS)

i was using this where

ifeq ($(findstring --network sepolia,$(ARGS)),--network sepolia)
NETWORK_ARGS := --rpc-url $(SEPOLIA_RPC_URL) --private-key $(PRIVATE_KEY) --broadcast --verify --etherscan-api-key $(ETHERSCAN_API_KEY) -vvvv
endif

but I was still getting an error
while running it maunally without using make mint in the terminal it succeeded don't know why it was not working with make

Originally posted by @highHumann in #402 (reply in thread)

I have tried most of the methods mentioned in the discussions tab. But at the end i got the same output. so i have to open the issue. if any one have a sloution then please discuss , it will be very helpful.

Lesson

Lesson 3

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/yPzY4ifyGjY?t=8

Describe the bug

^ from lesson 3

^ from lesson 2 (same intro)

its weird

Hey guys,
I'm having difficulties with the last part of video 1; deploying "SimpleStorage.sol" in foundry; where there is a script to deploy the smart contract.
here is the script from the first video of the course:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

// import {Script} from "../lib/forge-std/src/Script.sol";
import {Script} from "forge-std/Script.sol";
import {SimpleStorage} from "../src/SimpleStorage.sol";

contract DeploySimpleStorage is Script {
    function run() external returns (SimpleStorage) {
        vm.startBroadcast();
        SimpleStorage simpleStorage = new SimpleStorage();
        vm.stopBroadcast();
        return simpleStorage;
    }
}

then when I run "forge script scr/SimpleStorage.sol" in the command line. I get the following error:

[⠊] Compiling...
[⠃] Compiling 22 files with 0.8.21
[⠰] Solc 0.8.21 finished in 4.80s
Compiler run successful!
Error: 
Function `run()` is not implemented in your script.

I have tried the command with other test files but the issue still persists!

anyone has any ideas as to why it keeps referring to "run() " function while it has been defined within the script!

Discussed in #1282

[⠊] Compiling...
No files changed, compilation skipped
Error: 
error sending request for url (http://127.0.0.1:7545/): error trying to connect: tcp connect error: Connection refused (os error 111)

Context:
- Error #0: error trying to connect: tcp connect error: Connection refused (os error 111)
- Error #1: tcp connect error: Connection refused (os error 111)
- Error #2: Connection refused (os error 111)

forge create SimpleStorage --rpc-url http://127.0.0.1:7545 --interactive
```</div>

Lesson

Lesson 1

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/umepbfKp5rI?t=25276

Operating System

macOS (Intel)

Describe the bug

Hi everyone,
I have ran forge init and I'm getting the following error message. Can't figure out how to get over this issue and would love help. Thanks.

jordanbishop@Jordans-MacBook-Pro foundry-simple-storage-f23 % forge init                    
──────────────
✖ 'init' is not a valid subcommand. See 'forge --help'
──────────────
ℹ Did you mean this?
  - forge join
  - forge asset
  - forge config
  - forge help
  - forge install
  - forge logs
  - forge ls
  - forge ps
  - forge start
  - forge stop
  - forge tx
  - forge use
  - forge web

I also ran forge which and got the following.

jordanbishop@Jordans-MacBook-Pro foundry-simple-storage-f23 % which forge
/usr/local/bin/forge

Lesson

Lesson 9

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://www.youtube.com/watch?v=sas02qSFZ74&t=14654s

Describe the bug

In video, Lesson 9, Chapter Chainlink VRF Recap where you explain modulo (timestamp 4:04:27),

you mention some modulo calculations that are wrong:

2 % 3 = 1  // This is WRONG! Correct result is 2
2 % 6 = 0  // This is WRONG! Correct result is 2
2 % 7 = 1  // This is WRONG! Correct result is 2

I assume you wanted to say:

3 % 2 = 1
6 % 2 = 0
7 % 2 = 1

"Seems like Windows and Ubuntu WSL have different opinions on 'forge --version'. On Windows, it's all 'I got this,' but in WSL, it's like 'What command?'. 🙄 Any tips for syncing up these two worlds or should I just stick to the 'normal' terminal in VS Code? 🤔

Describe the enhancement

I have a subtitles folder where I will put the "raw" AI-generated subtitles. If someone would like to edit them, I will then upload them to YouTube so others can watch and understand easier!

Describe the enhancement

Make File Command From Chapter 7 Is not working for some users.

The Install Make Command for Users who have installed Ubantu as a VM in Windows was not working; hence, I wanted to add the alternative link, which is from the official documentation with a tutorial.

Lesson

Lesson 7

https://www.youtube.com/watch?v=sas02qSFZ74)

No response

Operating System

Windows

Describe the bug

here i am trying to run test using forge test.

fund me.sol
function fund() public payable {
        if (msg.value.conversionRate(s_priceFeed) < MINIMUM_USD) {
            revert Not_Sufficient_Amount();
        }```

test.sol
```   function testFailWithoutEnoughEth() public {
        // this test supposed to be passed when we don't have enough eth to
        vm.expectRevert(); // the next line should revert
        fundMe.fund(); // here we are trying to send the zero eth to
    }```

this test should be passed as i am using vm.expectRevert() here why this test failing

Lesson

Lesson 6

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

No response

Operating System

Windows

Describe the bug

when i try to call "retreive()" function this error appears
' ' '
(code: 3, message: execution reverted, data: Some(String("0x")))
' ' '

here is my integration script.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;
import {Script, console} from "forge-std/Script.sol";
import {DevOpsTools} from "lib/foundry-devops/src/DevOpsTools.sol";
import {FundMe} from "../src/FundMe.sol";

contract FundFundMe is Script {
    uint256 SEND_VALUE = .1 ether;

    function fundFundMe(address mostrecentDeployment) public {
        FundMe(payable(mostrecentDeployment)).fund{value: SEND_VALUE}();

        console.log("EgtgGE%s", SEND_VALUE);
    }

    function run() external {
        address mostrecentDeployment = DevOpsTools.get_most_recent_deployment(
            "FundMe",
            block.chainid
        );
        console.log("ugh9uq3r9grtgqegffuuuefbufueu");
        vm.startBroadcast();
        fundFundMe(mostrecentDeployment);
        vm.stopBroadcast();
    }
}

and trace are

  [1139609] → new DevOpsTools@0x7FA9385bE102ac3EAc297483Dd6233D62b3e1496
    └─ ← 5692 bytes of code

  [277305] → new FundFundMe@0x34A1D3fff3958843C43aD80F30b94c510645C316
    └─ ← 1164 bytes of code

  [57509] FundFundMe::run()
    ├─ [33494] DevOpsTools::get_most_recent_deployment("FundMe", 31337 [3.133e4]) [delegatecall]
    │   ├─ [0] VM::readDir("./broadcast", 3) [staticcall]
    │   │   └─ ← [("IO error for operation on /home/kalmrigaya/hello_foundry/foundry-fund-me/broadcast: No such file or directory (os error 2)", "/home/kalmrigaya/hello_foundry/foundry-fund-me/broadcast", 0, false, false)]
    │   ├─ [0] VM::toString(31337 [3.133e4]) [staticcall]
    │   │   └─ ← "31337"
    │   └─ ← revert: No run-latest.json file found for specified chain
    └─ ← revert: No run-latest.json file found for specified chain


Gas used: 57509
Error: 
script failed: revert: No run-latest.json file found for specified chain

Originally posted by @sagoto80 in #1181

Lesson

Lesson 12

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/wUjYK5gwNZs?t=8205

Operating System

Windows

Describe the bug

redeemCollateral and redeemCollateralForDsc need to have isAllowedToken(tokenCollateralAddress) modifier

Summary

Everyone can call redeemCollateral and redeemCollateralForDsc with address that is not allowed. This vulnerability may result in a critical error, specifically: [FAIL. Reason: panic: arithmetic underflow or overflow (0x11)]. This error occurs when attempting to subtract an amount from zero in the following code snippet: s_collateralDeposited[from][tokenCollateralAddress] -= amountCollateral;

Code Snippet

https://github.com/Cyfrin/foundry-defi-stablecoin-f23/blob/7dca86be19d3eea563daa599d3c73840eff16437/src/DSCEngine.sol#L151C8-L151C8

https://github.com/Cyfrin/foundry-defi-stablecoin-f23/blob/7dca86be19d3eea563daa599d3c73840eff16437/src/DSCEngine.sol#L166

Tool used

Manual Review

Recommendation

Include isAllowedToken(tokenCollateralAddress) modifier. This will revert if invalid collateral address is passed.

function redeemCollateralForDsc(address tokenCollateralAddress, uint256 amountCollateral, uint256 amountDscToBurn)
        external
        moreThanZero(amountCollateral)
+      isAllowedToken(tokenCollateralAddress)
    {
        _burnDsc(amountDscToBurn, msg.sender, msg.sender);
        _redeemCollateral(tokenCollateralAddress, amountCollateral, msg.sender, msg.sender);
        revertIfHealthFactorIsBroken(msg.sender);
    }

    function redeemCollateral(address tokenCollateralAddress, uint256 amountCollateral)
        external
        moreThanZero(amountCollateral)
+      isAllowedToken(tokenCollateralAddress)
        nonReentrant
    {
        _redeemCollateral(tokenCollateralAddress, amountCollateral, msg.sender, msg.sender);
        revertIfHealthFactorIsBroken(msg.sender);
    }

Lesson

Lesson 7

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

No response

Operating System

None

Describe the bug

Hello,

I'm having a problem with the following line:

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

Source "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol" not found: File not found. Searched the following locations: "".solidity(6275)

If I use forge build everything works as expected, but vscode "doesn't know" the remapping configuration hence I get the error.

VSCode doesn't show an error if I use:

import {AggregatorV3Interface} from "foundry-fund-me-f24/lib/chainlink-brownie-contracts/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

but then Foundy shows an error.

Is there a way to solve this?

Lesson

Lesson 6

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/umepbfKp5rI?t=25596

Describe the bug

The Better TOML extension is deprecated, and the Even Better TOML extension should be used.

Describe the enhancement

We should split up sections into TikToks and YouTube shorts

Describe the enhancement

Each section of the video is broken up by a screen that looks like this:

It would be great if we could add timestamps in this repo for each one of these.

Lesson

Lesson 6

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/umepbfKp5rI?si=UOKIZgpCAJoqP_gP&t=28405

Operating System

Windows

Describe the bug

I have this issue when type "npx thirdweb deploy"

const raw = this.data.get(problem.where).raw?.[problem.from]
                                                     ^

SyntaxError: Unexpected token '.'
    at wrapSafe (internal/modules/cjs/loader.js:915:16)
    at Module._compile (internal/modules/cjs/loader.js:963:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)
    at Module.require (internal/modules/cjs/loader.js:887:19)
    at require (internal/modules/cjs/helpers.js:74:18)
    at Object.<anonymous> (/mnt/c/Users/admin/AppData/Roaming/nvm/v19.4.0/node_modules/npm/lib/utils/config/definition.js:33:5)
    at Module._compile (internal/modules/cjs/loader.js:999:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)

Lesson

Lesson 1

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://www.youtube.com/watch?v=umepbfKp5rI&t=6155s

Describe the bug

Thank you for creating the video! I noticed a small error in the caption in this screenshot - I believe it should say "on top of a Layer 1" rather than what's currently written.
It's not a major issue at all, I just wanted to provide the feedback in case it's helpful for improving the accuracy of the captions for future viewers.
Thank you again for the great work on these educational videos!

Describe the enhancement

I fixed some typos and improved the text in the README.md. Opening a PR for it!

Describe the enhancement

So when we were doing the conversion of user deposited collateral to USD we loop through each token supported by our contract and get the balance of the user for each of them and then went ahead to add it all up to the total collateral deposited , code below

function getTotalCollateralDepositedByUser(address _user) private view returns(uint256 _totalCollateralDeposited){
        for(uint256 i; i < s_protocolSupportedCollateralToken.length; i++){
            address[] memory copied_s_protocolSupportedCollateralToken = s_protocolSupportedCollateralToken;
            address token = copied_s_protocolSupportedCollateralToken[i];
            uint256 balanceOnToken = s_userToAmountDepositedOnVariousCollateralToken[_user][token];
            _totalCollateralDeposited += balanceOnToken;
        }

        return _totalCollateralDeposited;
    }

The above code seem very fine and okay , but lets assume the scenario where a user deposited 1 eth and 2 btc to our protocol, doing the above would help get the total deposited collateral but i think we would have problem when we want to convert the total collateral deposited to USD, the reason being which of the token USD price would we be using ?.

We never ran into that issue during the tutorial because we never deposited wbtc which makes everything turns out as expected.

So i think we are supposed to get the total collateral deposited by a user for each of the supported token store them separately and and then get the equivalent USD price for each of them separately and after getting the USD value for each of the deposited Collateral then we can sum them to have the total collateral deposited by each user in USD. like that we would be calculating the USD value for different token with their respective USD price.

Maybe i am not making sense but thats what i found and i think i should share as @PatrickAlphaC mentions the code would be going through an Audit. Thanks for all you do @PatrickAlphaC.

If this is confirmed to make sense then i would fork the repo and make the amendment, thanks 🙏

Lesson

Lesson 9

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/sas02qSFZ74?t=14685

Describe the bug

Love the videos, they have been very helpful. Just noticed a minor error when explaining modulo which might trip someone up if they haven't come across it before. Examples shown on remix in the demo are the wrong way around.

It shows on screen (line 11):

// 2 % 2 = 0. 2 % 3 = 1.      2 % 6 = 0.  2 % 7 = 1

What it should be:

// 2 % 2 = 0. 3 % 2 = 1.      6 % 2 = 0.  7 % 2 = 1

Describe the enhancement

It would be great if someone could:

1. Convert the YouTube video -> a transcript (using a tool like Descript to auto convert)
2. Manually update the transcript where the tool gets it wrong
3. Send me the .srt file

Then I will add it to YouTube

In the video, the constructor takes a single argument: address _vrfCoordinator.
In the updated code of VRFV2WrapperConsumerBase.sol, it takes two.
Namely:
constructor(address _link, address _vrfV2Wrapper) { LINK = LinkTokenInterface(_link); VRF_V2_WRAPPER = VRFV2WrapperInterface(_vrfV2Wrapper); }

Stuck at this point.
Confused as to what it needs as the second argument.

Lesson

Lesson 4

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

No response

Operating System

None

Describe the bug

Line 40 of the 4-Lesson.sol challenge code contains a typo in the "10e10" number:
actualPrice = actualPrice * 10e10;

Should be "1e10":
actualPrice = actualPrice * 1e10;

To pass the challenge, add an extra zero to your answer.
For examlpe, if getPrice() returns:
1637320000000000000000, you need to paste this number plus 0, like this:
16373200000000000000000

@guyInTheChair Did you save the file?

Originally posted by @alymurtazamemon in #82 (comment)

Mine gave a different error message:

Error: 
Compiler run failed:
Error (7858): Expected pragma, import directive or contract/interface/library/struct/enum/constant/function/error definition.
  --> script/DeploySimpleStorage.s.sol:16:1:
   |
16 | }
   | ^

ChatGPT tells me this:
"The error is caused by an incomplete import statement. It seems that the SimpleStorage contract is not being imported correctly.

Please make sure that the path to the SimpleStorage.sol file is correct. Double-check that the file is located in the correct directory relative to the DeploySimpleStorage.sol file.

Assuming that the SimpleStorage.sol file is in the ../src/ directory, you should update the import statement as follows:

solidity
Copy code
import {SimpleStorage} from "../src/SimpleStorage.sol";
Make sure the path is correct and try compiling the code again."

That was yesterday. Now I run the exact script (unchanged from yesterday) again, and it compiles successfully. This is the second time I had to quit the program and than continue the next day, and it suddenly works.

Any thoughts as to why?

2(d11ts1)/1^-b^^-2/9 + ddx(Ass.V).dmb
R2 = rm^2 + 2/1 (oh^-eipi^n2-2mf.rsc
n^3x.u'/ r^2, 64pi rnt?d3/4.int
-L^2 = 0rc . g3/2pi / Am^-pu.u*.lk
z = r^2 v^2 - 2*.zip
3+1/2Nmf = -Aq' . 1/2hco.dnc
Trc . dt^2 = oH
OH = 5Tu' . 3/5q^2
dryHe = Frv^vu^2
10KT = / . 2/1 Api/-pu.ucc
DM = ds^5/4 - pu^-2mû'. -hu!
arcsen^2 = Apu'-mf'/1
5/0- . Mo - ddt^2E = GEo . Q^nk . pEc - Ec2
dt = 3/2j - dc2 . t^h + KPR+-4/27
mu^2 = -t^2 + arcsen r^216pirsc^-2/1
s = -2/1 rsc^2 - TKqu' +DEc
o = -pmiEc't^3/2
a = d-pmu . QPRRct
q = +- -2/1dp (-R)
cos159 = ^8pi^KPR 24/7 + 2/3 pidrt^2ms / r^2arsen3/0
FRmo = Amu + KP445 -r^2h
gcr =dt^3 . -1/2dt

Lesson

Lesson 6

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://www.youtube.com/watch?v=umepbfKp5rI&t=27765s

Describe the bug

We can use interactive to enter private key when we are running scripts, instead of --interactive/-i, we can use --interactives <num>/-i <num>, and specify the sender address with --sender

For example :

forge script script/DeploySimpleStorage.s.sol --rpc-url http://127.0.0.1:8545 --broadcast --sender 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 -i 1

Describe the enhancement

When going to chain.link/education/defi link in Lesson1 section = `

What have Smart Contracts done so far?` . It is showing that the link is bad, that is its showing error 406. Maybe you can update the link, or I can do so.

Describe the enhancement

So on the Readme File for chapter 7 the link to chainking brownie Contract is not present would like to add that link in Readme.md file.

It will be used to import contracts.

timestamp for refernce https://youtu.be/sas02qSFZ74?t=467

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I am trying to compile my code and i am getting this error message. Please, I need help with this.

ParserError: Expected primary expression.
--> FundMe.sol:25:2:
|

Originally posted by @Goodybag1 in #1210

Describe the enhancement

When trying to follow along the video there's no AggregatorV3Interface.sol file in the chainlink repo. You can find it here (https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.7/interfaces/AggregatorV3Interface.sol) instead (not in v08 though) but I'm not sure if they're the same.

Interfaces
⌨️ (4:37:08) | Interfaces

For reference - ChainLink Interface's Repo

Describe the enhancement

In Lesson 6,

cast wallet import your-account-name --interactive
Enter private key:
Enter password:
`your-account-name` keystore was saved successfully. Address: address-corresponding-to-private-key

After following the above steps, below step has to be followed

forge script <script> --rpc-url <rpc_url> --account <account_name> --sender <address> --broadcast

This step is missing.

Describe the enhancement

I was going through readme file In lesson 9 in which we deploy our own Link Token contract for anvil chain ht direct link to the contract was not there. It would be better if its included in the readme file with the time stamp.

Video TimeStamp

Link

Github Repo Link that i would like to add

Link

Also the Command to install the solmate package

forge install transmissions11/solmate --no-commit

When I type forge test --fork-url $SEPOLIA_RPC_URL to test all the contract. It shows me this error message:

[FAIL. Reason: Setup failed: Custom Error d8a3fb52:(0x8f478e8C52EccD5012a0C8B112766bAD5d67C55F)]

I passed the deployerKey to vm.startBrodcast() than got this error. It seems that the RaffleTest doesn't setup, before testing !

Originally posted by @AnouarBF in #124

Lesson

Lesson 12

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/wUjYK5gwNZs?t=17213

Describe the bug

In the end of Lesson 12 I don't see any QR codes for the usual challenge at the end of every Lesson. I thought that this was intentionally like this.

On the contrary, I found that there is a Challenge 12 on:
Sepolia: https://sepolia.etherscan.io/address/0xe5760847db2f10a74fc575b4803df5fe129811c1#code
Arbitrum: https://arbiscan.io/address/0x3dbbf2f9acfb9aac8e0b31563dd75a2d69148d64#code

So I understand that QR code is missing in the end of Lesson 12 and should be added in an update.

Lesson

Lesson 7

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/sas02qSFZ74?list=PL4Rj_WH6yLgWe7TxankiqkrkVKXIwOP42&t=1649

Describe the bug

The -m regex option to forge test is deprecated. See --match-test.

Lesson

Lesson 6

Could you please leave a link to the timestamp in the video where this error occurs? (You can right click a video and "copy video URL at current time")

https://youtu.be/sas02qSFZ74?t=1640

Describe the bug

Others have been using -mt and I have been using --match-test ... May want to inject a quick blurb in the video that it's now -mt for "match test".

Lesson 11

Operating System

macOS (Apple Silicon)

Describe the bug

Hi to the foundry course community :)

I noticed some unnecessary type castings in 2 contracts.

In MoodNft.sol : https://github.com/Cyfrin/foundry-nft-f23/blob/1e0cb4ed67e79f219889c3fac98fff0e766fd64b/src/MoodNft.sol#L95

casting the result of abi.encodePacked() into a bytes variable (array of bytes) is redondant as abi.encodePacked() result is itself an array of bytes.

Same thing happens in DeployMoodNft.s.sol : https://github.com/Cyfrin/foundry-nft-f23/blob/1e0cb4ed67e79f219889c3fac98fff0e766fd64b/script/DeployMoodNft.s.sol#L41-L43

This time, abi.encodePacked() result, which is of bytes types, is converted to string, and then back to bytes.

I removed these castings and everything compiles and works well.

I can make a PR in the MoodNft repo if you confirm this issue.

Thanks a lot to @PatrickAlphaC for this AMAZING content :) !!!!