[TurboGears] GenerationException: Can only return a string, got unicode instead: /FrontPage

[James]

Hi,
when I follow the Tutorials: 
http://www.turbogears.org/2.0/docs/main/Wiki20/wiki20.html.
I get an error:
GenerationException: Can only return a string, got unicode instead: /FrontPage
why?
 
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