[web2py] Why am I getting this error ?

[topher.baron]

Traceback (most recent call last):
  File "gluon/main.py", line 478, in wsgibase
  File "gluon/main.py", line 193, in serve_controller
  File "gluon/compileapp.py", line 435, in run_controller_in
TypeError: 'NoneType' object is not callable



I make a jquery ajax call to a url that calls the following function :

def addNewick():

    try:
        import applications.tred.modules.newick as newick
        reload(newick)
        node = newick.parse( request.vars.newickString )
    except:
        return 'parseError'

    if auth.is_logged_in():
        id=db.userNewick.insert( user_id = auth.user.id, name =
request.vars.newickName, newick = request.vars.newickString, comments
= request.vars.newickComment )

    else :
        id = ''.join( [ 's', str(len(session.trees)) ] )
        session.trees.append( { 'id': id,
                                'name': request.vars.newickName,
                                'string': request.vars.newickString,
                                'comment':
request.vars.newickComment } );

    return id


I've written to a debug file during each part of the function.  The
return line is being executed and somewhere something is going wrong.
If anyone could help out that would be great.


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