Made an error message a bit clearer.
Made an error message a bit clearer.

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