How to solve [error: cannot find symbol public class UnityPlayerActivity extends Activity implements IUnityPlayerLifecycleEvents]

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i am doing a project that need to integrate the unity vuforia ar to flutter. I having the error as follow. Anyone can help please?
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I have follow steps from https://pub.dev/packages/flutter_unity_widget to do the export and import and https://github.com/juicycleff/flutter-unity-view-widget/issues/689 to solve the aar file not found problem. Then, this error occur.

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