May be the code you added mistake. Please have a look on the below code snippet and try again.
<body <?php body_class();
/**
* supernews_action_body_attr hook
* @since supernews 1.0.0
*
* @hooked supernews_body_attr- 10
*/
do_action( ‘supernews_action_body_attr’ );?>
//Your Code Goes Here //
>Hope, this will solve your issues.
Regards