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

MajidKamali

Hi
I have a program that works without problem in linux, but in windows I get following warning and errors and then application terminates:

QQmlPropertyCache: QQuickItem has FastProperty class info, but has not installed property accessors
Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.

I googled and found these results but none of them works for me, as I have import QtQuick 2.5 in all of my qml files.

also I have a C++ class that is exposed to qml and inherited from QQuickItem:

class MStore : public QQuickItem {
...
};

and used in qml this way:

import QtQuick 2.5
import MStore 1.0

Store {
...
}

might that be the problem?

Thanks :-)