PHP Code:
Warning: require_once(includes/classes/module_installer.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/macdonald-sporrans.com/htdocs/MYCUSTOMADMIN/ssu.php on line 10

Fatal error: require_once() [function.require]: Failed opening required 'includes/classes/module_installer.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/macdonald-sporrans.com/htdocs/MYCUSTOMADMIN/ssu.php on line 10 
Getting this error after installing. Read the other posts associated with this error and your response was the check the installation notes. I've checked them over twice, and as far as i'm aware - i'm following everything correctly.

Any help would be much appreciated.