Filesys::Df module error after upgrade

[Douglas Ward]

I am trying to upgrade MailScanner from version 4.49.7-1 to 4.55.9-1.  After
installing the upgrade I see the following error when trying to restart the
service:

[root at mxtest MailScanner]# service MailScanner restart
Shutting down MailScanner daemons:
         MailScanner:                                           [FAILED]
         incoming sendmail:                                     [  OK  ]
         outgoing sendmail:                                     [  OK  ]
Starting MailScanner daemons:
         incoming sendmail:                                     [  OK  ]
         outgoing sendmail: postfix/postfix-script: fatal: the Postfix mail
system is already running
                                                                [  OK  ]
         MailScanner:       Can't locate Filesys/Df.pm in @INC (@INC
contains: /usr/lib/MailScanner /usr/lib/perl5/5.8.7/i386-linux
/usr/lib/perl5/5.8.7 /usr/lib/perl5/site_perl/5.8.7/i386-linux
/usr/lib/perl5/site_perl/5.8.7 /usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.7/i386-linux /usr/lib/perl5/vendor_perl/5.8.7
/usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.6/i386-linux
/usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4
/usr/lib/perl5/vendor_perl . /usr/lib/MailScanner) at /usr/sbin/MailScanner
line 66.
BEGIN failed--compilation aborted at /usr/sbin/MailScanner line 66.
                                                                [  OK  ]

I have researched this fairly heavily and cannot seem to find a resolution.
I can find Df.pm on the server but cannot seem to make the service start
properly.  I have upgraded MailScanner several times on this box and haven't
seen this error before.  What am I missing?  I appreciate any help you could
offer.  Thanks!
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