[Python] ImportError: No module named x while loading a pickle file

i'm trying to unpickle a file but i got a module not found error.

script.py

import pickle
with open("file.pkl", "rb") as f:
data=pickle.load(f)


and i get this error when i run it: ImportError: No module named copy_reg but if i add 'import copy_reg' for example below import pickle, the script can correctly import it (but then script fails when the code reaches the pickle.load() line)

this is the relevant part of code in the pickle module:

pickle.py

def find_class(self, module, name):
__import__(module) #this line gives error
mod = sys.modules[module]
klass = getattr(mod, name)
return klass


Doing some tests i was able to see that no module can be imported (not even builtin module)

These are the first lines of the pickle file

file.PKL

ccopy_reg
_reconstructor
p0
...


I'm using python 2.7 Ask me if you need more details and I will provide them, thanks

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