I have the following directory structure.
I have edited the PHPExcel.php file with the following path. It still is now working.
define('PHPEXCEL_ROOT', dirname(__FILE__) . 'sites/all/lib/PHPExcel');
I have also used the full path listed at the top. I still cannot get Drupal to see it. Can someone send me and example or point me in the right direction. It is unfortunate you did not use Variables for the configuration.
I would appreciate any assistance you can offer. Thanks.