[]使用layaAir3D从unity3D中导出场景模型时报错

IndexOutOfRangeException: Array index is out of range.
LayaExport.DataManager.saveSkinLmFile (UnityEngine.SkinnedMeshRenderer skinnedMeshRenderer, System.String savePath)
LayaExport.DataManager.getSkinnedMeshRendererComponentData (UnityEngine.GameObject gameObject, .JSONObject customProps)
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.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)