Thanks!
I just did what you said. Installed Qt Creator 3.1 and used the engine class. Works perfect!
I also manually transfered all data from my old projekt into a new one.
Just saw that some new files will be added to the project if you create a new project within Qt Creator 3.1. “qtquick2controlsapplicationviewer” was replaced with “deployment” folder and the qml-files(quick2) will be added to the resources folder instead of the QML folder.
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