IconEngine' object has no attribute '_pixmapGenerators'.

[ZouaouiB]

i'm having this error

File "C:\python\MOA-Toolkits_Virtualenv\lib\site-packages\iconify\core.py", line 211, in pixmap
return self.pixmapGenerator(mode=mode, state=state).pixmap(size)
File "C:\python\MOA-Toolkits_Virtualenv\lib\site-packages\iconify\core.py", line 129, in pixmapGenerator
return self._pixmapGenerators.get(
AttributeError: '_IconEngine' object has no attribute '_pixmapGenerators'. Did you mean: 'pixmapGenerator'?