我用的cocos2d-js ，说我这个问题 cc.Sprite.extend is not a function

Cocos2d-x
#1

cc.Sprite.extend is not a function 什么原因啊 ？
S: E:/cocospace/CatAndDog/runtime/win32/script/jsb_boot.js:887:TypeError: cc.FileUtils is undefined

(evaluatedOK == JS_FALSE)