DBMail 2.0 Release Candidate 2 + squirrelmail error

I got following errors anyone recognize it?

SquirrelMail after login:

ERROR : Could not complete request.
Unknown response from IMAP server: 1.

also
Warning: strpos(): Offset not contained in string. in
sqmail/functions/imap_messages.php on line 522


anyway, and the syslog says:

Feb 26 20:40:42 cube dbmail/imap4d[3322]: dbmysql.c,db_query: executing
query [SELECT mbx.name, mbx.mailbox_idnr, mbx.owner_idnr FROM mailboxes
mbx LEFT JOIN acl ON acl.mailbox_id = mbx.mailbox_idnr JOIN subscription
sub ON sub.user_id = '2' AND sub.mailbox_id = mbx.mailbox_idnr WHERE
mbx.owner_idnr = '2' OR (acl.user_id = '2' AND acl.lookup_flag = '1')
GROUP BY mbx.name, mbx.mailbox_idnr, mbx.owner_idnr]

Feb 26 20:40:42 cube dbmail/imap4d[3322]: dbmysql.c,db_query: query
[SELECT mbx.name, mbx.mailbox_idnr, mbx.owner_idnr FROM mailboxes mbx LEFT
JOIN acl ON acl.mailbox_id = mbx.mailbox_idnr JOIN subscription sub ON
sub.user_id = '2' AND sub.mailbox_id = mbx.mailbox_idnr WHERE
mbx.owner_idnr = '2' OR (acl.user_id = '2' AND acl.lookup_flag = '1')
GROUP BY mbx.name, mbx.mailbox_idnr, mbx.owner_idnr] failed

Feb 26 20:40:42 cube dbmail/imap4d[3322]: dbmysql.c,db_query:
mysql_real_query failed: You have an error in your SQL syntax near 'ON
sub.user_id = '2' AND sub.mailbox_id = mbx.mailbox_idnr WHERE
mbx.owner_idnr ' at line 1
Feb 26 20:40:42 cube dbmail/imap4d[3322]: db.c,db_list_mailboxes_by_regex:
error during mailbox query
Feb 26 20:40:42 cube dbmail/imap4d[3322]: db.c,db_findmailbox_by_regex:
error listing mailboxes


   wuming@xxxxxxxx <mail created 20:36 26/02>