Sound Error message at startup FreeBSD 8.0

Code:
etc/rc.d/systct1: unable to set dev/pcm 0 Play4 Vchans=4


I noticed the above error message on Freebsd startup. I would like to know may be this would be the reason i am not getting audio output for youtube videos Your thoughts are welcomed If it the reason Please tell me how to rectify it
 
What's in /etc/sysctl.conf?

And what soundcard do you have?
 
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