Qt 4.7 QML/C++ Error : "Package not found" and "Module foobar is not installed"

[wysota]

I mean setting up Qt 4.7 to allow me to use C++ with QML and QML Designer.

QML and C++ are two different languages. You can't use them "together".

At this moment in time, I'm unable to do so as when I create C++ classes and expose them to QML and use them, they work and the application will run, but I cannot use QML Designer as it does not recognise these classes as QML objects and gives me the errors you see in the images.

Did you tell Creator about them by providing an appropriate extension plugin?