Error, Username taken

Hey

Apologies if this has already been mentioned but i have a message that says Error, username taken when i try to log in? it is my username and password that i have always used? is this a bug or how would i rectify this?

Many thank

I also have the error. Correct credentials, old account.

Edit: sorry i have now fixed

Glad to hear the issue has been resolved!

If anyone else gets these error messages, please see here. Thanks!