Ubuntu – Apache directory with a new install shows 404

I just went through all the steps to configure something to be run on Apache called OntoWiki. I set up and tested Apache, PHP, and other tools that are required and all seem to be fine.

If I go to http://localhost/ I do see my Apache server loading up. But if I go to http://localhost/myow/ (the directory if the installation) then it gives me a 404 page.

I checked and I do have a directory /var/www/myow in my Ubuntu setup. Any idea for what can be causing the 404 page to get displayed despite having the right directory?

I even changed the directory permissions to be 777, but the OntoWiki welcome page is still not getting served up.

Thanks,
Alex