that error is a mysql error, not a webserver error.
many releases of mysql run that error on startup, but it does not hinder the performance of the server.
check your processes to see if mysql is running. if not, you night wanna try and edit mysql.server and replace @HOSTNAME@ with your hostname.
also, check your mysql error logs. and when starting your webserver (i'll assume apache), you'll wanna run "apachectl start".