Alright, the easy fix is to redownload. Or this might be because.. the server just crashed a while ago, it is now back up. If not, it may just be because since the server crash, the capacity has been lowered from 300 to 160. If you're failing to connect after choosing your character, its because you're trying to enter a crowded map, maybe avoid that (fluorite) Like i said it was lowered to 160.
Though, please reinstall, t'is easy.
If you need anything else, just ask.