[Python] _pickle.UnpicklingError: invalid load key, 'x'

I have this pickle file, which I'm trying to unpickle using the following Python script:

import _pickle as pickle

pickle_file = open('bof.pkl', 'rb')
data = pickle.load(pickle_file)


When I run the program, I get the following error:

Traceback (most recent call last):
File "unpickle.py", line 4, in <module>
data = pickle.load(pickle_file)
_pickle.UnpicklingError: invalid load key, 'x'.


How can I solve this issue, as I couldn't find a way to do that.

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