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The 'can't pickle module objects' error in Python typically occurs when you try to serialize or deserialize a Python module object using the Pickle module. This error occurs because module objects are not pickable, which means they cannot be converted into a byte stream that can be stored or transmitted. This error commonly occurs when you attempt to pickle an instance of a class that is defined in a module, or if you try to pickle a function that is defined in a module. To resolve this error, you may need to refactor your code to avoid pickling module objects, or you can consider using a different serialization library that supports pickling of module objects.