ld: symbol(s) not found for architecture arm64 (Flutter) about facebook-ios-sdk

[daltonbr]

I had a similar error in Unity - perhaps it is the same root cause.

I managed to get the two symbols that were missing

Undefined symbol: _FBRewardedVideoAdBridgeOnServerRewardFailure
Undefined symbol: _FBRewardedVideoAdBridgeOnServerRewardSuccess

ld: warning: Could not find or use auto-linked framework 'CoreAudioTypes': framework 'CoreAudioTypes' not found
ld: warning: Could not find or use auto-linked framework 'UnitySwiftProtobuf': framework 'UnitySwiftProtobuf' not found
Undefined symbols for architecture arm64:
  "_FBRewardedVideoAdBridgeOnServerRewardFailure", referenced from:
      _RewardedVideoAdBridgeIOS_FBRewardedVideoAdBridgeOnServerRewardFailure_m31803DFCCAA3EB40D0E35D9A58626508AC8736FD in libGameAssembly.a[27](vtaseqwcbsnk.o)
      _RewardedVideoAdBridgeIOS_Create_mB983DC16F649F7C1F4DA25945CB5F4FB3DB1888E in libGameAssembly.a[27](vtaseqwcbsnk.o)
  "_FBRewardedVideoAdBridgeOnServerRewardSuccess", referenced from:
      _RewardedVideoAdBridgeIOS_FBRewardedVideoAdBridgeOnServerRewardSuccess_m1D22BCF0E541A62E8415B1A71D2A077E999E28F8 in libGameAssembly.a[27](vtaseqwcbsnk.o)
      _RewardedVideoAdBridgeIOS_Create_mB983DC16F649F7C1F4DA25945CB5F4FB3DB1888E in libGameAssembly.a[27](vtaseqwcbsnk.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Xcode version
15.3

Facebook iOS SDK version
17.0.0 (The Unity version)

Dependency Manager
1.15.2 CocoaPods

---

A workaround to get rid of the compilation errors was to disable the AudienceNetwork code that relied on the missing symbols in RewardVideoAd.cs. Still, this isn't a good solution as this could cripple the functionality of the package.

// [DllImport("__Internal")]
// private static extern void FBRewardedVideoAdBridgeOnServerRewardSuccess(int uniqueId,
//         FBRewardedVideoAdBridgeExternalCallback callback);

// [DllImport("__Internal")]
// private static extern void FBRewardedVideoAdBridgeOnServerRewardFailure(int uniqueId,
//         FBRewardedVideoAdBridgeExternalCallback callback);

[daltonbr]

I've searched the source doe in FBAudienceNetwork 6.15.0 and indeed it doesn't contain those two symbols - which we had on version 6.14.0.
You can download both versions on this page

/FBAudienceNetwork-6.15.0/Static/FBAudienceNetwork.xcframework/ios-arm64/FBAudienceNetwork.framework/Headers/FBRewardedVideoAdBridge.h

6.15.0

...

FB_EXPORT void FBRewardedVideoAdBridgeOnLoad(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnImpression(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnClick(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnError(int32_t uniqueId, FBAdBridgeErrorCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnDidClose(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnWillClose(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnVideoComplete(int32_t uniqueId, FBAdBridgeCallback callback);

FB_EXTERN_C_END

6.14.0

FB_EXPORT void FBRewardedVideoAdBridgeOnServerRewardSuccess(int32_t uniqueId, FBAdBridgeCallback callback);
FB_EXPORT void FBRewardedVideoAdBridgeOnServerRewardFailure(int32_t uniqueId, FBAdBridgeCallback callback);

[daltonbr]

For context, in my case, the code requesting those missing symbols was the Unity version of the FAN - which is "stuck" in version 6.4.0 since 2021.

Most likely we will try to remove it and only use the iOS SDK (in my case through AppLovin).

[antonengelhardt]

@daltonbr Thanks for your help on this.

Im not sure, if this really helps me a lot, because we're using Flutter and i don't really have much control over the Pods (that flutter manages on its own) and even less control on the source code of the Pods.

I have removed the facebook_app_events pub for now and i'll wait until a new version comes out that eventually fixes this.

[hellysmile]

@antonengelhardt

I've manually edited ios/Podfile.lock like this

  - facebook_app_events (0.0.1):
    - FBAudienceNetwork (~> 6.12)
    - FBSDKCoreKit (~> 16.0)
    - Flutter
  - FBAudienceNetwork (6.12.0)

And removed FBAudienceNetwork from SPEC CHECKSUMS

To force bind FBAudienceNetwork to lower version

cd ios && pod install

and it works ;)