[Python] Invalid argument when saving pickle file [duplicate]

I am trying to save my machine learning model into a pickle file:

rf_pickle_path=os.path.join(os.getcwd(),"penguin_ml\random_forest_penguin.pickle")
rf_pickle = open(rf_pickle_path, "wb")
pickle.dump(rfc, rf_pickle)
rf_pickle.close()


But I got the error below:

File "c:\Python_Sync\penguin_ml\penguins_ml.py", line 39, in <module>
rf_pickle = open(rf_pickle_path, "wb")
OSError: [Errno 22] Invalid argument: 'C:\\Python_Sync\\penguin_ml\random_forest_penguin.pickle'


Not sure why? Thanks for helping.

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