Error and now diferent server!?
First off, run virus scans now.
Next change your password
Why?
To me, it sounds like someone has your account info and just transferred you and is about to take your account from you.
Once we rule out that possibility please be patient
If you’re ticket’s three days old, post it in the section in the support forums for it. If you don’t have a ticket and just bug reported it go make a ticket!
Sadly, this is the only help I can give :/
ArenaNet Communications Manager
It’s true that getting an error could be someone else accessing your account and removing you from the game. (Only one connection is possible, and a new connection “overwrites” the previous one.) Also, the fact you were transferred to a different game world seems to point to potential security issues.
Please contact Support by filing a ticket through the “Ask a Question” tab on that linked page. They will be able to assist you. For tips on what information to provide in a ticket — mostly intended for security reasons to establish that you own the account — please read this post and provide as many suggested details as possible to expedite the ticket.
Communications Manager
Guild & Fansite Relations; In-Game Events
ArenaNet