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QML-Type "is not a type" when starting application - Main QML-File does not see other QML-File(s)

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After solving the big problem with getting QT Mobility compiled and running (http://qt-project.org/forums/viewthread/29008/) I am facing a new problem: I am using Eclipse with PyDev and QT 4.7.4 with QT Mobility 1.2. My App which I want to get run has the following structure: TwitterCrawler.py with the following main code: if __name__ == "__main__":     frontend = os.path.join(os.path.realpath(os.path.dirname(__file__)), "frontend")     app = QApplication(sys.argv)     qmlRegisterType(Controller, "TwitterCrawler", 1, 0, "Controller")         view = QDeclarativeView()     view.setResizeMode(QDeclarativeView.SizeRootObjectToView)     root = view.rootContext()       view.setSource(os.path.join(frontend, "frontend.qml"))     view.show()         app.exec_()     sys.exit()         frontend/frontend.qml frontend/PageStack.js frontend/PageStack.qml frontend.qml contains the following code: import QtQuick 1.1 import TwitterCrawler 1.0 import QtMobility.location 1.2 import "tweets.js" as Tweets   PageStack{                              // line 26     id: rootPage     width: 900     ... This ends up with: D:\Daten\Eclipse\TwitterCrawler\frontend\frontend.qml:26:1: PageStack is not a type The frontend folder also contains a frontend.qmlproject with the following code: import QmlProject 1.1   Project {     mainFile: "frontend.qml"       /* Include .qml, .js, and image files from current directory and subdirectories */     QmlFiles {         directory: "."     }     JavaScriptFiles {         directory: "."     }     ImageFiles {         directory: "."     }     /* List of plugin directories passed to QML runtime */     // importPaths: [ "../exampleplugin" ] } As this is a program which was not created by me and already worked at the developer who gave it to me, I am now not sure what I might have done wrong or what the developer did in another way…

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