[Mimedefang] Error running mimedefang

[Fulano]

Hi folks.

I'm trying to use the clam Antivirus with mimedefang.
I follow the instructions of 
http://sial.org/howto/mimedefang/clamav/

I configure the mimedefang-filter file like the how to says.

The mimedefang.pl has identified the clamd installed on my system.
This is my mailllog:

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Jan 21 10:38:40 nina mimedefang-multiplexor: Slave 0 resource usage: req=0, scans=0, user=0.640, sys=0.050, nswap=0, majflt=416, minflt=2517, maxrss=0, bi=0, bo=0
Jan 21 10:38:42 nina mimedefang-multiplexor: Starting slave 0 (pid 4253) (1 running): Bringing slaves up to minSlaves (2)
Jan 21 10:38:43 nina mimedefang-multiplexor: Slave 0 stderr: Global symbol "$FoundVirus" requires explicit package name at /etc/mail/mimedefang-filter line 614. Global symbol "$FoundVirus" requires explicit package name at /etc/mail/mimedefang-filter line 712. Compilation failed in require at /usr/bin/mimedefang.pl line 4023.
Jan 21 10:38:43 nina mimedefang-multiplexor: Reap: Idle slave 0 (pid 4253) exited normally with status 255 (SLAVE DIED UNEXPECTEDLY)

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Someone know what is happen?

Thx and Rgds.

Fulano de Tal