Cocos Studio Mac : Problem loading JSON scene in C++

I use Cocos Studio on a Mac and try to load my JSON scene using C++.
I use CSLoader::createNode(“Scene.json”) which crashes because it uses the value “classname” which is not stored in the JSON file at all.
This old thread describes the problem : Help with cocostudio under osx Seems like it is still not fixed. Does anyone know how to load JSON scenes stored in Cocos Studio for Mac in C++ ? Or is this still not supported ?