求助！cocos2.1.2版本. The referenced asset used in "db://assets/resources/levels/level5.prefab" is not found, it may have been deleted. Detailed information: Used by "cc.PrefabInfo" uuid: "d01690b2-2ca9-4178-ae5a-e6e2d33fae9e" 但是level5.prefab 明明在文件夹下面啊

[358445267 (小趴菜)]

cocos2.1.1 /cocos2.·1.2版本都存在这个问题。游戏模拟器可以，但是打包发这个错误警告。怎么破大佬？