'NoneType' object has no attribute 'html'

This error message typically occurs when you try to access the 'html' attribute on a variable that is not defined or has a value of None.

Here is an example code snippet that can cause this error:

page = None
html_content = page.html

In this example, the variable 'page' is set to None, which means it has no value. When we try to access the 'html' attribute of 'page', the error message 'NoneType' object has no attribute 'html' is raised because None has no 'html' attribute.

To fix this error, you need to make sure that the variable you are trying to access the 'html' attribute on has a valid value. You can do this by checking if a variable is None before you try to access its attributes:

if page is not None:
    html_content = page.html
else:
    print("Error: page is None")