Flutter Unity iOS Build Undefined symbols for architecture arm64:

Hi i am trying to integrate my unity project for flutter iOS build, when i use flutter run in terminal i am getting this error below, Xcode's output: ↳ === BUILD TARGET UnityFramework OF PROJECT Unity-iPhone WITH CONFIGURATION Debug === Undefined symbols for architecture arm64: "_onUnityMessage", referenced from: _UnityMessageManager_onUnityMessage_m8A904C01129EA827FDD76B08B34FAF9A6C4B5E36 in Assembly-CSharp.o (maybe you meant: _UnityMessageManager_onUnityMessage_m8A904C01129EA827FDD76B08B34FAF9A6C4B5E36) ld: symbol(s) not found for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Could not build the precompiled application for the device. Error launching application on iPad.