[Dovecot] quota - dict permission denied

[Abu Gid]

when I enabled quota plugin the following error occured :

net_connect_unix(/usr/local/var/run/dovecot/dict-server) failed: Permission
denied
Any ideas?
My config are as follows :
..
dict {
  #quota = mysql:/etc/dovecot-dict-quota.conf
  quotadict = mysql:/usr/local/etc/dovecot-dict-quota.conf
}
..
quota = dict:storage=81920:messages=5000 proxy::quotadict

/usr/local/etc/dovecot-dict-quota.conf:
connect = host=xxxxx dbname=xxxxx user=xxxxx password=xxxxx
table = quota
select_field = current
where_field = path
username_field = username

-----
I can connect to the database thru mysql prompt. dovecot version 1.0 rc5

-- azhar --
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