cocostudio场景加载不了,求大神~

Scene* HelloWorld::createScene()
{
// ‘scene’ is an autorelease object
auto scene = Scene::create();

Node* myScene = SceneReader::getInstance()->createNodeWithSceneFile(“public/taskScene1.json”);
scene->addChild(myScene);

// return the scene 
return scene; 

}

运行弹窗口显示错误 Expression: child!=nullptr
究竟什么原因~~