Hey, sorry for the late reply! In fifth username is a pretty goofy spelling of "Goldfish": it has a '0' (zero) in place of the 'O' and a '$' in place of both the 'i' and the 's', so the username is "G0ldf$h". Hopefully it was just a typo, since that would have given you the error you described, if not please do let me know. I hope that didn't stop you from enjoying the game though, thanks for pushing through and finding a way around it!