[Tutor] where does the ViewerFrameWorkGUI come from

[lina]

Hi,

I met below issue:

File "/usr/lib/python2.7/dist-packages/ViewerFramework/VF.py", line
369, in __init__
    self.GUI = ViewerFrameworkGUI(self, title=title,
NameError: global name 'ViewerFrameworkGUI' is not defined


can someone tell me how to examine,

I mean, how to examine, what would you do when you face the problem?

Thanks with best regards,