title: Python TypeError: 'bool' object is not callable
body: <p>How i can fix this problem.it is on script im using or it is on the Python.Im using Debian OS
  And trying to install this code
  <a href="https://github.com/rkubik/paypark" rel="nofollow noreferrer">https://github.com/rkubik/paypark</a></p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 2309, in __call__
      return self.wsgi_app(environ, start_response)
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 2295, in wsgi_app
      response = self.handle_exception(e)
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1741, in handle_exception
      reraise(exc_type, exc_value, tb)
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 2292, in wsgi_app
      response = self.full_dispatch_request()
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1815, in full_dispatch_request
      rv = self.handle_user_exception(e)
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1718, in handle_user_exception
      reraise(exc_type, exc_value, tb)
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1813, in full_dispatch_request
      rv = self.dispatch_request()
    File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1799, in dispatch_request
      return self.view_functions[rule.endpoint](**req.view_args)
    File "/var/paypark/paypark/frontend/auth.py", line 14, in auth_login
      if current_user.is_authenticated() or form.validate_on_submit():
  TypeError: 'bool' object is not callable
  </code></pre>