Any idea what this is? Does this indicate that mail is not making it into the ticketing system?

-----Original Message-----
From: Cron Daemon [mailto:root@localhost.localdomain]
Sent: Monday, February 15, 2010 1:00 AM
To: root@localhost.localdomain
Subject: Cron <root@SUNPRDOTRSHD> /opt/otrs/bin/PostMasterMailbox.pl >> /dev/null

ERROR: OTRS-PMAccount-10 Perl: 5.8.8 OS: linux Time: Sun Feb 14 22:00:03 2010

 Message: Found no ID for 3!

 Traceback (18350):
   Module: Kernel::System::Queue::QueueGet (v1.110) Line: 821
   Module: Kernel::System::Ticket::GetSubscribedUserIDsByQueueID (v1.416.2.8) Line: 3209
   Module: Kernel::System::Ticket::Article::ArticleCreate (v1.232.2.1) Line: 378
   Module: Kernel::System::PostMaster::NewTicket::Run (v1.75) Line: 245
   Module: Kernel::System::PostMaster::Run (v1.83) Line: 351
   Module: Kernel::System::MailAccount::POP3::Fetch (v1.6) Line: 153
   Module: Kernel::System::MailAccount::MailAccountFetch (v1.9) Line: 380
   Module: main::Fetch (v1.10) Line: 181
   Module: /opt/otrs/bin/PostMasterMailbox.pl (v1.10) Line: 94

ERROR: OTRS-PMAccount-10 Perl: 5.8.8 OS: linux Time: Sun Feb 14 22:00:03 2010

 Message: Found no ID for 3!

 Traceback (18350):
   Module: Kernel::System::Queue::QueueGet (v1.110) Line: 821
   Module: Kernel::System::Ticket::Article::ArticleGet (v1.232.2.1) Line: 1762
   Module: Kernel::System::PostMaster::Filter::FollowUpArticleTypeCheck::Run (v1.4) Line: 47
   Module: Kernel::System::PostMaster::Run (v1.83) Line: 387
   Module: Kernel::System::MailAccount::POP3::Fetch (v1.6) Line: 153
   Module: Kernel::System::MailAccount::MailAccountFetch (v1.9) Line: 380
   Module: main::Fetch (v1.10) Line: 181
   Module: /opt/otrs/bin/PostMasterMailbox.pl (v1.10) Line: 94