Here are some screens:
http://cdawzrd.port5.com/images/error.jpg << listenserver
http://cdawzrd.port5.com/images/error2.gif << dedicated

edit: i realize that the second screen is realbot, not joebot, but i used it because realbot doesn't throw the error until i add a bot (in this case by turning the internet mode on). Joebot fails at startup (possibly because it creates bots at startup?) with the same error.