squid cannot run squidGuard, please HELP

[Ricardo Perez]

HI ! 
I have this message in my cache.log (squid)

WARNING: Cannot run '/usr/sbin/squidGuard' process

i have this line in my squid.conf

redirect_program /usr/bin/squidGuard

all files in squid and squidGuard have nobody.nobody

could you tell me some hints ??

Thanks !!! Note:   i have squid 2.4.STABLE1

- Ricardo