[Exim] Exiscan is not working

Hi,

I have latest Exim with Exiscan. Exiscan uses uvscan.
The problem is Exiscan is scanning when receives email but it doesn't say
there is virus and Exim continues delivery.
It adds X-Scanner: exiscan for exim4 (http://duncanthrax.net/exiscan/)
*18nkd5-000GKf-00*HOqL1wdaXCY*
header to emails.

I added following Exiscan config to Exim config.
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# Exiscan options

exiscan_condition = ${if or {{eq{$received_protocol}{esmtp}} \
                           {eq{$received_protocol}{asmtp}}  \
                           {eq{$received_protocol}{smtp}}} \
                           {1}{0} }

exiscan_timeout = 5m
exiscan_crypt_salt = fo

exiscan_av_condition = 1
exiscan_av_scanner = cmdline
exiscan_av_scanner_path = /usr/local/uvscan/uvscan
exiscan_av_scanner_options = --secure -rv --summary --noboot |
exiscan_av_action = reject

#exiscan_av_scanner_regexp_trigger = found
#exiscan_av_scanner_regexp_description = (Found.*)

exiscan_av_scanner_regexp_trigger = Found
exiscan_av_scanner_regexp_description = Found[: ] (.+)$