[vtkusers] QWidget: Must construct a QApplication before a QWidget

[Sanjin Pajo]

I am trying to use VTK with Qt and after building a sample program
Qt_visualizer (https://github.com/UnaNancyOwen/qt_visualizer), I run it and
I get the following error in Debug mode:

QWidget: Must construct a QApplication before a QWidget

and the following errors in Release mode:

ERROR: In C:\VTK-8.0.0\Rendering\OpenGL2\vtkWin32OpenGLRenderWindow.cxx,
line 653
vtkWin32OpenGLRenderWindow (0000000002A79780): failed to get
wglChoosePixelFormatARB

ERROR: In C:\VTK-8.0.0\Rendering\OpenGL2\vtkWin32OpenGLRenderWindow.cxx,
line 737
vtkWin32OpenGLRenderWindow (0000000002A79780): failed to get valid pixel
format.

ERROR: In C:\VTK-8.0.0\Rendering\OpenGL2\vtkOpenGLRenderWindow.cxx, line 816
vtkWin32OpenGLRenderWindow (0000000002A79780): GLEW could not be
initialized.

Thank you for any help in advance.

Best regards,
Sanjin P.
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