Debugging QML on android device

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http://qt-project.org – I have a qml project which I want to run and debug on android device. When I click Start Debugging I get the following errors: Could not connect to the in-process QML debugger. The application is not set up for QML/JS debugging. and in the Application Output window I get: "QML Debugger: Ignoring "-qmljsdebugger=port:11118,block". Remote debugger plugin has not been found." and the device screen stays black. Then I have to kill the application from the device manager of the phone to be able to run it from the device. So I cannot use the QML Prof (HowTos)