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

This error occurs when you try to access the `parameters` attribute of a `NoneType` object in Python.

Here's an example of how this error can occur:

model = None
params = model.parameters()

In this example, `model` is assigned the value of `None`, which means it doesn't have any attributes or methods associated with it. When we try to access the `parameters` attribute of `model`, Python raises an `AttributeError` because `NoneType` objects don't have a `parameters` attribute.

To fix this error, you need to make sure that the object you're trying to access the `parameters` attribute of is not `None`. Make sure that you have properly initialized your object and that it has been assigned a value before you try to access its attributes.