TypeError: 'NoneType' object is not callable

Question

This is my error. im running my django app on virtual environment server is running if i run the url in browser it showing this error also ("A server error occurred. Please contact the administrator")

(code_review) C:\code_review\code_review\comcast-nso-df-kt>python manage.py runserver

Watching for file changes with StatReloader

Performing system checks...

System check identified no issues (0 silenced).

February 19, 2020 - 17:13:11

Django version 3.0.3, using settings 'mysite.settings'

Starting development server at http://127.0.0.1:8000/

Quit the server with CTRL-BREAK.

Traceback (most recent call last):

  File "c:\users\mpriya\appdata\local\programs\python\python37-32\Lib\wsgiref\handlers.py", line 137, in run

    self.result = application(self.environ, self.start_response)

  File "C:\code_review\lib\site-packages\django\contrib\staticfiles\handlers.py", line 68, in __call__

    return self.application(environ, start_response)

TypeError: 'NoneType' object is not callable

[19/Feb/2020 17:14:05] "GET /login HTTP/1.1" 500 59

Traceback (most recent call last):

  File "c:\users\mpriya\appdata\local\programs\python\python37-32\Lib\wsgiref\handlers.py", line 137, in run

    self.result = application(self.environ, self.start_response)

  File "C:\code_review\lib\site-packages\django\contrib\staticfiles\handlers.py", line 68, in __call__

    return self.application(environ, start_response)

TypeError: 'NoneType' object is not callable

[19/Feb/2020 17:14:07] "GET /favicon.ico HTTP/1.1" 500 59

This is my code

class StaticFilesHandler(StaticFilesHandlerMixin, WSGIHandler):

    """

    WSGI middleware that intercepts calls to the static files directory, as

    defined by the STATIC_URL setting, and serves those files.

    """

    def __init__(self, application):

        self.application = application

        self.base_url = urlparse(self.get_base_url())

        super().__init__()

    def __call__(self, environ, start_response):

        if not self._should_handle(get_path_info(environ)):

            return self.application(environ, start_response)

        return super().__call__(environ, start_response)