Running RSS Feed in Sidebar

I’d like the RSS feed of another site to run in the sidebar of my website, Evil Beet Gossip. The WP Codex provides example code for how to do this.

<h2><?php _e('Recent news from Some-Other Blog:'); ?></h2>
<?php // Get RSS Feed(s)
include_once(ABSPATH . WPINC . '/feed.php');

// Get a SimplePie feed object from the specified feed source.
$rss = fetch_feed('https://example.com/rss/feed/goes/here');

// 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);
?>

<ul>
    <?php if ($maxitems == 0) echo '<li>No items.</li>';
    else
    // Loop through each feed item and display each item as a hyperlink.
    foreach ( $rss_items as $item ) : ?>
    <li>
        <a href='<?php echo $item->get_permalink(); ?>'
        title='<?php echo 'Posted '.$item->get_date('j F Y | g:i a'); ?>'>
        <?php echo $item->get_title(); ?></a>
    </li>
    <?php endforeach; ?>
</ul>

The site whose RSS I want to import is here and the RSS feed for it is here. The code provided in the codex works when I use, say, CNN’s RSS feed, but it doesn’t work when I use the feed I want to use. It just stops loading when the PHP code starts running.

Is there something wrong or incompatible with this feed? Is there a change I need to make in the PHP code?