This is a server error..
Accounts are acting up; it's being addressed, and they're working on it. If you have an alternate account, use that, and if it works, it will confirm this is just the server issues and not your computer.
They are working on it, so be patient or use an alt.
As for your custom map, this means it could have gotten stuck on the server as well; will be fixed with a reset. In theory.
Like said, be patient prease