[otrs] IMAP: Can't process mail, email no 1 is empty!

Hi I am not able to fetchmail the error is "IMAP: Can't process mail, email no 1 is empty!.." some times the error is "Can't create PID PostMasterMailbox, because it's already running" I cleared the running PostMasterMailbox in Mysql Stopped all cron jobs Changed # set binmode # binmode ($Row, ':utf8'); No jobs running for postmastermailbox I restarted the server also, cleared router also. Still my problem is if the mailbox is empty when i click the fetchmail in GUI its telling finished but when any mails are in mailbox its taking long time and ends up with this error Can't process mail, email no 1 is empty! Pls advise ASAP Thanks in advance Rajesh