Class constructor problem

[MrBaseball34]

Seems that anytime I put anything in my class constructor except the call to the parent's constructor,
the class doesn't get loaded.

class ReportGenerator extends ObjectModel
{
 public $pdf_obj;
 public $debug_log;

 public function __construct() {
   parent::__construct();
   $this->debug_log = Configuration::get('PS_LOG_DEBUG_TABLE');
 } // public function __construct()

}

Why would this be happening?

Could it be that Configuration class is not yet loaded??
Are the classes in classes directory loaded in alphabetical order or????