QObject::connect: No such slot MainWindow::changeData in

website qobject__connect_ no such slot QObject::connect: No such slot QGroupBox::redundancyChangeOutput() QObject::connect: QObject poseidon xtreme slot gons@localhost:~> qdvdauthor QEventLoop: Cannot be used without QApplication : QObject::connect: No such signal QAction::

qobject__connect_ no such slot QObject::connect: No such slot KActionSelector::itemDoubleClicked QObject::connect: No such slot KActionSelector  slot does not exist whenever code is executed that tries to access an unknown signal or slot The error message is : Object :: connect : No such slot QObject  such as a button being pressed, the movement of a slider, the completion of an HTTP transaction, or Qt Development Understanding Signals and Slots

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