Changed an exception raised.
Changed an exception raised.

prashantpawar/supybot-rothbot,mazaclub/mazabot-core,raboof/supybot,ProgVal/Limnoria-test,jeffmahoney/supybot,kblin/supybot-gsoc,Ban3/Limnoria,Ban3/Limnoria,frumiousbandersnatch/supybot-code,mazaclub/mazabot-core,ProgVal/Limnoria-test,buildbot/supybot,haxwithaxe/supybot