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. Due to this the datasets won't show in our config window even when we implemented them.