[launchd-dev] correctly running service still getting 'Service only ran for 0 seconds.' log entries

[Todd Wade]

Hello,

I put http://paste.scsys.co.uk/483275 at 
/Library/LaunchDaemons/homebrew.mxcl.httpd24.plist and it started 
apache, but Server.app keeps logging 'com.apple.xpc.launchd[1] 
(homebrew.mxcl.httpd24): Service only ran for 0 seconds. Pushing respawn 
out by 10 seconds.'

Why is launchd trying to restart its target when it is already running?

Thanks!