We use ``` property var levels : activity.datasetLoader.item.data ``` to fetch the data from the json format in the variable level. This was done before the updating of the multiple_dataset branch. But now after the updating the multiple_dataset branch the core elemen DialogChooseLevel has been updated with new object at line 156 selectedInConfig and ``` proptery var levels : acitivity.datasetLoader.data ``` has been added ``` .item ``` has been removed. This gives ``` qrc:/gcompris/src/core/DialogChooseLevel.qml:156: TypeError: Property 'includes' of object 1,3,4 is not a function ``` in DialogChooseLevel.qml as we are not defining selectedInConfig in our data files. Due to which our datasets won't show in our config window even when we implemented them.