I have just upgraded from Sage 4.0.2 to Sage 4.2.1 and have
encountered  the same error mentioned by Stefan.
Is there a way to  fix the problem ?

Thanks in advance of any assistance!
Shing

On Dec 18, 7:59 pm, William Stein <[email protected]> wrote:
> On Fri, Dec 18, 2009 at 11:58 AM, Stefan <[email protected]> wrote:
> > Hi Robert,
>
> > Thanks for getting back to me.  The error I'm getting is:
>
> > File "/sage/sage/local/lib/python2.6/site-packages/sagenb/simple/
> > twist.py", line 207, in render
> > U = notebook_twist.notebook.user(username)
> > exceptions.AttributeError: 'NoneType' object has no attribute 'user'
>
> This is probably somehow caused by the transition to the new notebook,
> which is separated completely out from Sage, and which has undergone
> many changes.
>
> William
>
>
>
> > On Dec 18, 2:17 pm, Robert Bradshaw <[email protected]>
> > wrote:
> >> On Dec 18, 2009, at 8:53 AM, Stefan wrote:
>
> >> > Hi all,
>
> >> > I surfed through the discussion board and through the documentation on
> >> > trying to figure out how to get the simple server API up and running.
> >> > I made sure to run 'import sage.server.simple.twist' in my sage
> >> > prompt.  Is there a way to easily test Sage to see if the API is
> >> > functioning such as entering the address into the address bar:
>
> >> Yes, you should be able to do that. (See the example at the top of the
> >> file.)
>
> >> >http://localhost:8000/simple/login?username=myusername&password=mypas...
>
> >> > I get the dreaded "Internal Server Error" message.
>
> >> What does the terminal window where you started the notebook server say?
>
> >> - Robert
>
> > --
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>
> --
> William Stein
> Associate Professor of Mathematics
> University of Washingtonhttp://wstein.org

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