Webmail alias not logging in after change to Dovecot

[DJSADERS]

Hi,

I can login to the webmail with a email address created on a main domain fine and send and recieve emails fine, however if i try to login to a domain alias via webmail i get the error below:

Code:

Dec 23 17:39:40 server dovecot: IMAP(EMAIL@DOMAIN.COM): dict quota: URI missing from parameters: dict:user::proxy::quotadict
Dec 23 17:39:40 server dovecot: imap-login: Login: user=<EMAIL@DOMAIN.com>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured

i followed the how to, to install dovecot and pysieved, and then install roundcube, which all went fine, but im left with the problem above and i cannot seem to find the problem.

Any help would be appreciated.
Thanks