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Python WNDPROC handler failed Traceback (most recent call last): File "systraywin32.pyc", line 128, in _wndproc File "systraywin32.pyc", line 251, in on_clicked File "systray.pyc", line 358, in on_left_click File "systray.pyc", line 364, in handle_first_event File "gajim.py", line 1720, in handle_event TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types