public function __construct ($class, $id) {
		parent::__construct(
			sprintf(
				PartKeepr::i18n("The entity %s with the id %d could not be found"),
				$class,	$id));
	}
	public function __construct () {
		parent::__construct(PartKeepr::i18n("Username or Password wrong."));
	}
	public function __construct ($username) {
		parent::__construct(
			sprintf(
				PartKeepr::i18n("User %s already exists."),
				$username));
	}
	public function __construct ($id) {
		parent::__construct("The session with the id $id could not be found");
	}
	public function __construct () {
		parent::__construct(PartKeepr::i18n("Storage Location not found."));
	}
	public function __construct ($id) {
		parent::__construct(sprintf(PartKeepr::i18n("Category %d not found."), $id));
	}
	public function __construct ($username) {
		parent::__construct(
			sprintf(
				PartKeepr::i18n("The user %s doesn't exist. Maybe the user was already deleted."),
				$username));
	}