QDeclarativePropertyCache: QQuickItem has FastProperty class info, but has not installed property accessors

[halogenx]

In trying out the 3d tutorials I got the following error:

QDeclarativePropertyCache: QQuickItem has FastProperty class info, but has not installed property accessors.

I'm using Qt5 on Ubuntu 11.04 and the error seems to appear as long as I have any property set on the viewport.
Does anyone know what could be causing it?

Thanks

[mardy]

I ran into the same problem when importing a module which defined some objects derived from QQuickItem.
Adding a "import QtQuick 2.0" line solved the problem.