LoaderException constructor

 public
\Bitrix\Main\SystemException::__construct(
 string $message = "",
 integer $code,
 \Exception $previous = null
);

Non-static method is called when creating class instance and allows performing actions within it when object is created.

Parameter	Description	Version
$message	Exception message
$code	Code that throws exception.
$previous	Previous exception. Used for building chain of exceptions.