[Dovecot] IMAP(aweaver): quotactl(Q_GETQUOTA, /dev/sda1) failed: Invalid argument

Anyone have a solution for this, it appears in the log every time a user accesses their E-Mail via IMAP it obviously relates to filesystem quotas.

I'm running:

  Linux version 2.6.9-34.ELsmp

              dovecot-1.0.rc2

              Disk quotas for user aweaver (uid 1880): 

              Filesystem  blocks   quota   limit   grace   files

quota limit grace

              /dev/sda1   72172  512000  640000            7167

0 0

Relevant config(/usr/local/etc/dovecot.conf):

mail_plugins = quota imap_quota

quota = fs

any advice would be lovely.

Thanks,

-Drew