ReferenceError: callback is not defined！！编辑器报错！一大堆红色的！看不懂啥意思

Creator 2.x
#1

ReferenceError: callback is not defined
at new PetExtraction (eval at (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/CCClass.js:486:20), :10:4)
at instantiateObj (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:185:25)
at instantiateObj (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:156:51)
at enumerateCCClass (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:108:53)
at enumerateObject (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:120:17)
at Function.doInstantiate [as _clone] (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:91:13)
at cc_Node._instantiate (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/utils/base-node.js:645:45)
at Object.instantiate (/Applications/CocosCreator.app/Contents/Resources/engine/bin/.cache/dev/cocos2d/core/platform/instantiate.js:53:38)
at Object.c.getDumpableNode (/Applications/CocosCreator.app/Contents/Resources/app.asar/editor/page/scene-utils/utils/prefab.js:1:3223)

ReferenceError: callback is not defined

版本：creator 2.05 beta1 , 我就是拖啦一个prefab 到场景中，出现这堆报错，prefab好像没啥问题。可以跑

#2

有的报错可以无事的，经常报，不管他就行，或者重启编辑器~

#3

跟重启没关系，总是报错。很担心

#4

1、排查下是不是项目本身损坏了，新建一个项目测试下会不会出现异常的错误
2、项目文件夹下 temp、library、local这三个文件夹可能导致异常，可以删除后重新生成
3、系统盘用户目录下的.CocosCreator文件夹为creator配置文件夹，删除当前目录下除了插件目录packages之外的文件夹和文件

#5

嗯嗯，谢谢，我有空排查下。