For example, using the OrganizerModel from QML gives the following error:

QMetaProperty::read: Unable to handle unregistered datatype 'QQmlListProperty<QDeclarativeOrganizerItem>' for property 'QtOrganizer::QDeclarativeOrganizerModel::items'

This seems to be due to missing namespace qualifier in properties for types in the QtOrganizer namespace.

For example, the code in git:

Q_PROPERTY(QQmlListProperty<QDeclarativeOrganizerItem> items READ items NOTIFY modelChanged)

doesn't work but after modifying it to:

Q_PROPERTY(QQmlListProperty<QtOrganizer::QDeclarativeOrganizerItem> items READ items NOTIFY modelChanged)

the application works fine.

QtCreator also shows a lot of errors until the fix is applied.