O DIALux não funciona, ao iniciar a tela fica toda preta e quando tento fechar aparece um erro:

Untreated exception: Object reference not set to an instance of an object.

System.NullReferenceException

Object reference not set to an instance of an object.

at Dial.Dialux.Gui.MainWindow.get_IsGuiLocked()

at Dial.Dialux.Gui.MainWindow.OnClosing(Object sender, CancelEventArgs args)

at System.Windows.Window.OnClosing(CancelEventArgs e)

at System.Windows.Window.WmClose()

at System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

at System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Como proceder?