Hark! Coding!
Give it a little time then. There are a few other people complaining of crashes today so it might be a problem with the server. If you haven't changed, added, or modified any files recently then just close the game and wait for a few more minutes to see if things sort themself out.
The Cape has been making alot of people crash so if you're trying to enter characters that are in the Cape that could be why you keep crashing. What error message if any do you get when the game crashes? Have you checked your particles folder for double particles? If you have any delete them they would have numbers at the end like _0 or _1 etc.