TypeError: 'NoneType' object is not subscriptable

This error occurs when you try to access an element of an object that is None. The error message indicates that you are trying to use the subscript operator (i.e. []) on a NoneType object, which is not allowed.

For example:

my_list = None
print(my_list[0])

In this example, my_list is None, so it is not possible to access the first element of the list using the subscript operator.

To fix this error, you need to make sure that the object you are trying to access is not None. You can do this by checking if the object is None before trying to access it:

if my_list is not None:
    print(my_list[0])

Alternatively, you can initialize the object to an empty list or other default value to avoid the NoneType error:

my_list = []
print(my_list[0])