[]unity导出动画如何使用 root motion node

想使用动画的位移，设置root motion node 以后导出会报错。要怎么样避免错误？或者在laya3d里面有没有其他方式使用动画位移？
 
KeyNotFoundException: The given key was not present in the dictionary.
System.Collections.Generic.Dictionary`2[System.String,System.Collections.Generic.List`1[System.String]].get_Item (System.String key) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150)
LayaExport.DataManager.saveLaniData (UnityEngine.GameObject gameObject, .JSONObject obj)
LayaExport.DataManager.getAnimatorComponentData (UnityEngine.GameObject gameObject, .JSONObject component, System.Collections.Generic.List`1 linkSprite)
LayaExport.DataManager.getComponentsData (UnityEngine.GameObject gameObject, .JSONObject node, .JSONObject child, Vector3 position, Quaternion rotation, Vector3 scale, System.String& goPath)
LayaExport.DataManager.getGameObjectData (UnityEngine.GameObject gameObject, System.String gameObjectPath, .JSONObject parentsChildNodes, Boolean ignoreNullChild)
LayaExport.DataManager.getSceneNode ()
LayaExport.DataManager.saveData ()
LayaExport.DataManager.getData ()
LayaAir3D.exportResource (Boolean isDebug) (at Assets/LayaAir3D/LayaTool/LayaAir3D.cs:435)
LayaAir3D.OnGUI () (at Assets/LayaAir3D/LayaTool/LayaAir3D.cs:337)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)