Traceback (most recent call last):
File "/Users/dpr964/.virtualenvs/AgentsPy/lib/python3.8/site-packages/agents/ui.py", line 355, in closeEvent
self.model.close()
File "/Users/dpr964/.virtualenvs/AgentsPy/lib/python3.8/site-packages/agents/model.py", line 463, in close
self._close_func(self)
AttributeError: 'Model' object has no attribute '_close_func'