how do i remove nessus ssl certificate during scan?

[kisha at lissaganda.com]

%sysctl kern.version
kern.version=OpenBSD 3.6 (MMP) #2: Mon Dec 13 23:33:49 PHT 2004
    ken at ccp:/usr/src/sys/arch/i386/compile/MMP

why is it, nessus ssl certificate always appear, after the scan test, though i add the option -x 
even the  long command line name '--dont-check-ssl-cert'

here's the command that i tried.

% nessus -n -c .nessusrc -V -T -x html -q 127.0.0.1 1241 user passwd test  test_result.htm

% nessus -n -c .nessusrc -x -V -T html -q 127.0.0.1 1241 user passwd test  test_result.htm

% nessus -x -n -c .nessusrc -V -T html -q 127.0.0.1 1241 user passwd test  test_result.htm

the same command also with '--dont-check-ssl-cert'  any idea what i have missed here? thanks in advance