Make sure to read to compile code.
All #include's of .hpps have to match where you have placed the files in your computer. Example: #include "/Users/hecthor/Desktop/fall_2019/462/sampleCode/TechnicalServices/Persistence/SimpleDB.hpp"
Make sure to compile every cpp file seperately creating .o files. Example: g++ -std=c++17 -c main.cpp
Once all .o files have been created, compile all .o files into an executable file. Include the path if some .o files are not at the root. Example:g++ main.o UI/SimpleUI.o TechnicalServices/Persistence/SimpleDB.o Domain/AccountManagement/U serAccounts.o Domain/Library/Session.o -o main
Run the executable file ./main