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Poll_Timer MailParse? Error Message

Popfile v1.1.3 in Windows 10 using Outlook 2010 generates Poll_Timer "Unmatched (in regex ... POPFile/Classifier/MailParse.pm line 2012, <GEN500> line 8." error message sporadically. This results in subsequent POP3 requests to download messages not working until PC is rebooted. I cannot figure out the pattern of why this occurs or what to do about it without the time-consuming reboot. Any suggestions?