Qt for Python (PySide/Shiboken)

so that's what I get file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString file:///C:/Users/Markus/Documents/Python/TTT-TimeTrackTool/src/qml/pages/projectsPage.qml:128:29: Unable to assign [undefined] to QString TableView: failed loading index: 117 TableView: failed loading index: 149 TableView: failed loading index: 181 TableView: failed loading index: 118 TableView: failed loading index: 150 TableView: failed loading index: 182 TableView: failed loading index: 119 TableView: failed loading index: 151 TableView: failed loading index: 183 TableView: failed loading index: 120 TableView: failed loading index: 152