!] Please run this script in Python 3.11 to prevent extraction errors during unmarshalling

To avoid extraction errors during unmarshalling in Python 3.11, you should ensure that your data is properly formatted and compatible with the version's built-in serialization mechanisms, such as pickle or json. Here's a brief explanation:

1. **Pickle**: If you're working with custom objects, make sure they have a `__getstate__` method that returns a serializable dictionary. Then, use `pickle.dumps()` and `pickle.loads()` for serialization and deserialization.

import pickle

class MyClass:
    def __getstate__(self):
        return {'a': self.a, 'b': self.b}

obj = MyClass(a=1, b=2)
serialized_data = pickle.dumps(obj)
# To deserialize:
deserialized_obj = pickle.loads(serialized_data)

2. **JSON**: For JSON, you can use the `json` module. Make sure your classes have a `to_dict()` method that converts them to a dictionary before serialization:

import json

class MyClass:
    def to_dict(self):
        return {'a': self.a, 'b': self.b}

obj = MyClass(a=1, b=2)
json_data = json.dumps(obj.to_dict())
# To deserialize:
deserialized_obj = MyClass.from_dict(json.loads(json_data))

Here, `from_dict` would be a staticmethod or classmethod if needed.

If the issue persists, check if there are any backward compatibility issues between the version of Python and the data structure being used.