Yeah just got this message too. Hopefully it'll be running again soon? I think there was a thread like this here before, though this is my first time getting the error myself.
Once you're a full member, you'll be able to enter the chat room. After you've been here for at least two weeks and have made at least fifty posts, you can apply for full membership, and if your application is approved (which is nearly guaranteed as long as you stay out of trouble and don't just post short posts to hit the 50 mark as quickly as possible), you'll become a full member and will gain access to the chat room.