AttributeError: 'NoneType' object has no attribute 'find_all'

This error occurs when you try to call the `find_all` method on a `NoneType` object. This means that the variable you are trying to access is not pointing to any object in memory.

To fix this error, you need to ensure that the variable is pointing to a valid object before calling any methods on it. You can do this by checking if the variable is not `None` before calling the method, or by initializing the variable to a valid object before using it.