Make a single page in WordPress available only for Admin and Subscribers

Question

please try this

if ( have_posts() ) : while ( have_posts() ) : the_post();
   if ( get_post_status (get_the_id()) == 'private' ) {
     if ( current_user_can( 'administrator' ) ) { 
        the_title();
        the_content();
     } else if ( current_user_can( 'subscriber' ) )  {
        the_title();
        the_content();
     } else  {
        echo 'this post is private';
     }
    } else {
        the_title();
        the_content();
    }

endwhile; 
endif;