How to load Cocos Studio scene file from Lua

cocos2d-x Lua
#1

I have created a test scene in Cocos studio (version 2.0.5) and published it to a .csb file. Then I try loading it from my lua game (using cocos2d-x 3.2):

local node = ccs.SceneReader:getInstance():createNodeWithSceneFile("MainScene.csb")

But this always returns nil. What do I need to do to load the scene succesfully?