problem with snort and the file "features.log"

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hi to all,

i got a problem with my snort.... i' m trying to calculate the features

 of a traffic data using the preprocessor of  snort and tcpreplay...
 unfortunately when i use these commands:
 tcpreplay -i lo  -p 4 /../../outside.tcpdump
 and with snort :
 ./snort -i lo -c ../../snort.conf

when i go to see the file /var/log/snort/features.log is empty ...
 the file has been genereted each time and subscribed  but is always
 the same thing is for the file alert.log

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