Apache Web-Serving with Mac OS X, Part 4
Subject:   Error starting apache
Date:   2003-04-01 04:19:02
From:   anonymous2
Response to: Error starting apache

This message comes when U don't have the root password. Plus some instance(Processes) of Apache/HTTPD is already running.

So log in as root. Kill all the associated processes, then log in from ur UserID & start, it should work...