Error with Imap

[Kraenix]

Hello can anyone help me?

[25-May-2014 11:04:06 +0200]: IMAP Error: Login failed for [email protected] from IP. AUTHENTICATE PLAIN: Authentication failed. in /var/www/roundcube/roundcubemail-0.9.5/program/lib/Roundcube/rcube_imap.php on line 184 (POST /?_task=login&_action=login)

What can i do?
I stuck on this problem -.-

[JohnDoh]

that error message really says it all. the username and/or the password you have entered is wrong.

are you able to login with the same credentials from a different client?

[SKaero]

Is your email address really [email protected]? I'm guessing it should be [email protected].