CodeIgniter.php doesn't load, no errors are shown

[eluser]mrmeyers99[/eluser]
I just installed Ubuntu 10 and I got everything installed. When I tried to run a website that I had already created, the page was blank. After inserting some error messages, I found that the page crashes at this line:

Code:

require_once BASEPATH.'codeigniter/CodeIgniter'.EXT;

I know that file exists and has the right permissions. The weird thing is that no error messages are displayed, it just stops executing at that line. I have my error settings set to

Code:

error_reporting(E_ALL);
    ini_set('display_errors', '1');

Does anyone have any ideas what could be wrong or at least how to get it to show errors?