[otrs] IMAP on OTRS 2.3 beta 4

I'm running OTRS 2.3 beta 4 on Windows XP machine. I had it receiving over 600 emails with IMAP and now all of a sudden I get this error message when trying to run the IMAP: Software error: Got no Email at C:/OTRS/otrs//Kernel/System/PostMaster.pm line 92. Any suggestions? Thanks!