Found this :https://wiki.qt.io/Transition_from_Qt_4.x_to_Qt5 about this issue. This gets raised, when trying to use compiled widget (pyside-uic....), which has the retranslateUi() . ``` PySide QApplication::translate("Href_Gui", "Text:", 0, QApplication::UnicodeUTF8) ``` ``` PySide2 QApplication::translate("Href_Gui", "Text:", 0) ``` Not really sure how to tackle this down.