[Mimedefang] error in Graphdefang

[Ravi.P CMC Engr]

Dear All,
               I m getting the following error message while running 
graphdefang. my graph is not updated. pls give me suggestions to fix the 
error.

processing data file: /var/log/maillog
Corrupted storable string (binary v2.6) at ../../lib/Storable.pm 
(autosplit into ../../lib/auto/Storable/thaw.al) line 358, at 
/usr/lib/perl5/site_perl/5.8.1/MLDBM/Serializer/Storable.pm line 27


Thanks in Advance!

Ganesh S.P.