紧急！！！Spine3.8beta会对导出工程造成永久性损坏，导致所有工程报废，无法导入到Unity，致使所有动画需要退回低版本重新制作。
每个导入的动画都会这样报错，我真的要炸了，等于说我拿3.8开启保存的项目全部挂彩！低版本又打不开，我只能全部重做了，爆炸！爆炸！爆炸！爆炸！爆炸！
我可以提供工程测试
这个是从3.8beta导出的源文件，导入Unity就爆炸！
InvalidCastException: Specified cast is not valid.
Spine.Unity.Editor.SpineEditorUtilities+AssetUtility.GetRequiredAtlasRegions (System.String skeletonDataPath) (at Assets/Spine/Editor/spine-unity/Editor/SpineEditorUtilities.cs:639)
Spine.Unity.Editor.SpineEditorUtilities+AssetUtility.ImportSpineContent (System.String[] imported, System.Boolean reimport) (at Assets/Spine/Editor/spine-unity/Editor/SpineEditorUtilities.cs:810)
Spine.Unity.Editor.SpineEditorUtilities+AssetUtility.HandleOnPostprocessAllAssets (System.String[] imported) (at Assets/Spine/Editor/spine-unity/Editor/SpineEditorUtilities.cs:602)
Spine.Unity.Editor.SpineEditorUtilities.OnPostprocessAllAssets (System.String[] imported, System.String[] deleted, System.String[] moved, System.String[] movedFromAssetPaths) (at Assets/Spine/Editor/spine-unity/Editor/SpineEditorUtilities.cs:188)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <d7ac571ca2d04b2f981d0d886fa067cf>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <d7ac571ca2d04b2f981d0d886fa067cf>:0)
I have solved the problem, my runtime version is problematic, but I have to re-direct all previous animations. . . . .
