macos:Failed to find path for "flutter_assets"

[RFlame]

2021-02-02 15:19:43.716 widget_maker_2_0[31171:16202128] Failed to find path for "flutter_assets"
2021-02-02 15:19:43.717 widget_maker_2_0[31171:16202128] Failed to find path for "flutter_assets"
embedder.cc (860): 'FlutterEngineInitialize' returned 'kInvalidArguments'. The assets path in the Flutter project arguments was missing.
2021-02-02 15:19:43.717 widget_maker_2_0[31171:16202128] Failed to initialize Flutter engine: error 2