Server :: Apache2 - Suexec Error: Command Not In Docroot (/usr/bin/php-cgi)

Basically when I try execute a PHP script with SuexecUserGroup set, I get the following error:

uid: (501/uname) gid: (501/501) cmd: php-cgi
command not in docroot (/usr/bin/php-cgi)

Without SuexecUserGroup set, they work fine, but obviously aren't executed as the script's owner.

Here's one of the domain's configs:

Code:

<VirtualHost *:80>
ServerName www.domain
ServerAlias domain

[code]...

For a bit of background info, the end result i'm trying to achieve is for files that get uploaded via a php script to be owned by the user account that owns the script rather than by the apache user.