Dispatcher throws InvalidOperationException on Messagebox.Show in Textchanged event

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See this thread it describes the same problem as yours:

The exception is done on purpose to prevent reentrancy bugs caused by
weirdness resulting from altering the visual tree, while such an event
(which itself has been triggered by the visual tree altering) is
firing. If you really must confirm something when the state of
a UI element changes, delaying with Dispatcher.BeginInvoke is probably
the right thing to do.

To run code on the UI Thread do the following:

 Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
     {

        if (MessageBox.Show("Geen resultaat gevonden, " + errortext + ".\n Wilt u overschakelen naar handmatig? ", "Handmatig?", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
        {
            RB_handmatig.IsChecked = true;
        }
        else
        {
            //
        }
    }));

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