IOERROR: fstating sieve script

[lkolchin at univ.haifa.ac.il]

Hello All,
 
Could you please tell me what these entries in my log mean:
 
Oct 31 12:58:55 mail lmtpunix[14418]: lmtp connection preauth'd as postman
Oct 31 12:58:55 mail lmtpunix[14418]: IOERROR: fstating sieve script /var/lib/sieve/k/kuper/defaultbc: No such file or directory
Oct 31 12:58:55 mail lmtpunix[14418]: duplicate_check: <339EE3961A83C74F911FB275B67A725901682007 at atlas.cetil.local> user.kuper          0

 
How to deal with IOERROR: fstating sieve script?
What "duplicate_check:" means, and shjould I be worried about it?
 
 
Best Regards,
Leon Kolchinsky
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