[LayaAirIDE 2.0]TypeError: Cannot read property '_addRenderObject' of undefined

初次接触Laya只是想测试一下Laya开发微信3D小游戏 。 结果还没开始就卡在了导入Unity编辑的场景中 ，请问这个是什么问题？
TypeError: Cannot read property '_addRenderObject' of undefined
preload.js:55
at MeshSprite3D._onActive (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.d3.js:5617:17)
 
at MeshSprite3D._activeHierarchy (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:12325:18)
 
at Sprite3D._activeHierarchy (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:12328:62)
 
at Sprite3D._processActive (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:12313:18)
 
at Sprite3D._onAdded (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:12376:73)
 
at Sprite3D._onAdded (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.d3.js:5502:16)
 
at Sprite3D._setParent (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:12142:26)
 
at Stage.addChild (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:11998:22)
 
at GameUI.onLoadSceneOver (file:///E:/A_LayaDemo/test3Dscene/bin/js/bundle.js:28:24)
 
at Handler.runWith (file:///E:/A_LayaDemo/test3Dscene/bin/libs/laya.core.js:848:38)