[morefood2001]

I'm thinking your problem may be with permissions. Have you tried invoking the same command on the command line as a normal user on your server? That will give you clues to whats wrong.

If it doesn't work as a normal user, you might consider adding apache's user to the power users group (I wouldn't elevate it to admin because of a big security risk).

Hopefully this will help you get started at troubleshooting your problem.