TypeError

TypeError: 'NoneType' object is not subscriptable
Traceback (most recent call last)

    File "C:\Python38\Lib\site-packages\flask\app.py", line 2464, in __call__

    return self.wsgi_app(environ, start_response)

    File "C:\Python38\Lib\site-packages\flask\app.py", line 2450, in wsgi_app

    response = self.handle_exception(e)

    File "C:\Python38\Lib\site-packages\flask\app.py", line 1867, in handle_exception

    reraise(exc_type, exc_value, tb)

    File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise

    raise value

    File "C:\Python38\Lib\site-packages\flask\app.py", line 2447, in wsgi_app

    response = self.full_dispatch_request()

    File "C:\Python38\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request

    rv = self.handle_user_exception(e)

    File "C:\Python38\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception

    reraise(exc_type, exc_value, tb)

    File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise

    raise value

    File "C:\Python38\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request

    rv = self.dispatch_request()

    File "C:\Python38\Lib\site-packages\flask\app.py", line 1936, in dispatch_request

    return self.view_functions[rule.endpoint](**req.view_args)

    File "C:\school\project1\application.py", line 42, in login

    if username is not None and usernamedata[0] == username and passworddata[0] == password:

    TypeError: 'NoneType' object is not subscriptable