i have installed squirrel mail 1.4.22 with DovecotIMAP 1.xx version on mail server (postfix 2.3.3 with openLDAP 2).
To know usage of quotas in Squirrelmail, I installed Quota_usage plugin
in squirrel mail.
And also enabled QUOTA in IMAP_CAPABILITY option (Dovecot configuration file ).
After logging squirrel mail, the left hand side of the browser shows the following error ..

"Error Bad malformed request Query: server responded :Error on IMAP command GETQUOTAROOT unknown command.."

I want to lookup LDAP for Quota size.It is working with Courier-IMAP server.But not working with Dovecot.
I tried different versions of Quota_usage plugin .
Any one help me?????