Sophie message: Error: File was encrypted

Hi everyone.

I have a Redhat 9 box, with: Dual Sendmail + Amavisd-New 2.2.1 + Sophie 
3.04rc2 + sophos

Im getting the messages detailed below, does anybody knows how to deal 
with that stuff? I did a search at internet with no success.

Jan 10 16:01:48 av1 sophie[24617]: WARNING          : Error: File was 
encrypted
Jan 10 16:01:48 av1 sophie[24617]: WARNING          : Error: File was 
encrypted
Jan 10 16:01:49 av1 sophie[24568]: WARNING          : Error: File was 
encrypted

Thank you very much for your help.

-----------------------------------------
sweep -v output:

Product version           : 3.89.0
Engine version            : 2.27.1
Virus data version        : 3.89
User interface version    : 2.07.082
Platform                  : Linux/Intel
Released                  : 03 January 2005
Total viruses (with IDEs) : 98175

--------------

sophie -v output :
Sophos engine    : Sophos engine version 2.27
Sophie IDE       : Sophos IDE version 3.89 (detects 98175 viruses)
SAVI config      : /etc/sophie.savi
Max processes    : 20
Socket path      : /var/run/sophie
Umask            : 7
PID file         : /var/run/sophie.pid
Timeout          : 300 seconds
Running as user  : amavisd
Socket group     : amavisd
Logname          : sophie
Log facility     : 16 (mail)
Log priority     : 5 (notice)
Error strings?   : yes
Timestamps?      : no
Show virus name? : yes
Callbacks?       : yes
limit_classif    : 10
limit_nextfile   : 10000
limit_decompr    : 1000
socket_check     : yes
Sophie version   : 3.04rc2