Unobvious error using Python2.7 and CherryPy

forgetting_self_py27_cherrypy

Unobvious error using Python2.7 and CherryPy

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/cherrypy/_cprequest.py", line 656, in respond
    response.body = self.handler()
  File "/usr/local/lib/python2.7/site-packages/cherrypy/lib/encoding.py", line 188, in __call__
    self.body = self.oldhandler(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/cherrypy/_cpdispatch.py", line 34, in __call__
    return self.callable(*self.args, **self.kwargs)
TypeError: logout() got multiple values for keyword argument 'page_url'

This may mean you forgot the self argument.