请问各位，mac下的cocostudio要结合cocos2d-x 的哪个版本来用呢？
补充：
我用的是:cocos2d-x3.1.1
用法：auto *widget = dynamic_castui::Layout*(cocostudio::GUIReader::getInstance()->widgetFromJsonFile(“ui_design.json”));
但是报错：Assertion failed: (IsObject()), function FindMember, file external/json/document.h, line 620.