Yeah, seems to be a language problem (probably a newline got misplaced in a translation somewhere). Depending on what language your forum is using, you can fix it here: https://transifex.com/projects/p/nodebb
Weird. At least when I was on I wasn't getting any error messages (and it was working just fine). Your site is 502 again I guess it's down. Maybe send me a chat next time we're both online and we can try and figure out what's going on.