QApplication Instance Error

[Nfrancisj]

I figured out the issue, and solution. Nuke doesn't allow multiple instances.
I had to omit line 1, 2, and 5.

Not sure exactly why this works...but Nuke had issues calling those lines from inside a function. So instead of calling the function, I just call window.show()

[d_stranz]

Nuke doesn't allow multiple instances.

No, it is the Qt runtime that doesn't allow multiple QApplication instances. Nuke uses Qt and created the QApplication instance when it started up. If you are adding PyQt code to be used within Nuke, then you cannot create another QApplication instance, but must use the one already created.

[Nfrancisj]

Yes, thank you! That's what I meant to say, but couldn't find the right words.