Example Bug in Training Materials

http://qt.nokia.com/learning/online/training/materials/qt-essentials-qt-quick-edition
The above page has materials such as presentation slides and examples for QtQuick learner.
The examples include many qml files which are example, lab and solution, but one solution example seems not to work as expected.

It's sol-contancts.qml in "Qml Presenting Data" session.
A qml file "sol-" prefixed is a solution for lab? If that file is for a solution, it has to is modified as follows.

Please find the attached qml which is modified.