TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

This error message typically occurs when you try to convert a variable that is None (i.e. has no value) to an integer using the int() function.

For example:

x = None
y = int(x)  # TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

To fix this error, you need to ensure that the variable you are trying to convert to an integer has a valid value. You can do this by initializing the variable with a default value or by ensuring that it is assigned a value before it is used in the int() function.

For example:

x = 0  # default value
y = int(x)  # works fine

# or

x = some_function_that_returns_a_value()
if x is not None:
    y = int(x)  # only convert to int if x has a value