Pickle error unsupported

I use Python3.8 with django 3.0.1

and i get the following error unsupported pickle protocol: 5

File "C:\Users\U779\django_projects\8bit-apps\venv\lib\site-packages\cache_memoize_init_.py", line 131, in inner result = cache.get(cache_key, MARKER) File "C:\Users\U779\django_projects\8bit-apps\venv\lib\site-packages\django\core\cache\backends\db.py", line 51, in get return self.get_many([key], version).get(key, default) File "C:\Users\U779\django_projects\8bit-apps\venv\lib\site-packages\django\core\cache\backends\db.py", line 92, in get_many value = pickle.loads(base64.b64decode(value.encode()))