self::get_called_class() throws error

model.php

<?php

abstract class Base_DB_ORM_Model extends Kohana_Object {

	public function get_errors_filename()
	{
		$self = get_class($this);
		return call_user_func(array($self, 'errors_filename'));
	}

	public static function errors_filename() {
		$class_name = self::get_called_class();
		
		// Just get the Model's name and strip the 'Model_Leap_'
		return substr($class_name, 11);
	}


}