Library\PackageCache\com.unity.timeline@1.5.4\Editor\State\WindowState.cs(1014,41): error CS1061: 'Animator' does not contain a definition for 'UnbindAllHandles' and no accessible extension method 'UnbindAllHandles' accepting a first

 

Unity项目工程里面 有UnityEngine.AnimationModule.dll文件

这些.dll文件 的路径 本来在

C:\Program Files\Unity\Hub\Editor\2019.4.19f1c1\Editor\Data\PlaybackEngines\AndroidPlayer\Variations\il2cpp\Managed

 

重复的.dll文件，删除。