Medium Rss feed is not parsing in wordpress

This is my code for rss link but its not working, help me to find the solution

include_once( ABSPATH . WPINC . '/feed.php' );
// Get a SimplePie feed object from the specified feed source.
$rss = fetch_feed( 'https://medium.com/feed/......' );
if ( ! is_wp_error( $rss ) ) : // Checks that the object is created correctly
if ( ! is_wp_error( $rss ) ) : // Checks that the object is created correctly
    // Figure out how many total items there are, but limit it to 5.

    $maxitems = $rss->get_item_quantity( 5 ); 
    // Build an array of all the items, starting with element 0 (first element).
    $rss_items = $rss->get_items( 0, $maxitems );
endif;
?>