Same problem for IOS Simulator:
/macdev/qt542/Examples/Qt-5.4/qml/tutorials/extending-qml/chapter6-plugins/
Triggers the same QML "installed" error...
Debugging starts
QML debugging is enabled. Only use this in a safe environment.
QML Debugger: Waiting for connection on port 30001...
QQmlIns
Looking at the ../qt542/Examples/Qt-5.4/qml/tutorials/extending-qml/
project now for "installation" tips.
Qt examples may be suffering from the same "installation" problem:
Starting external tool "/macdev/qt542/5.4/clang_64/bin/qmlscene"
/macdev/qt542/Examples/Qt-5.4/qml/tutorials/extending-qml