fetch_rss() isn’t working

I’m using the code exactly as it says to here. and this is the warning i’m getting:

Warning: array_slice() [function.array-slice]: The first argument should be an array in /home/*****/blog/wp-content/themes/yellowhiteflower/yellowhiteflower/sidebar.php on line 23

    * No items

I have no idea how to fix this and I can’t find a plugin to work with this either, nor more info on google. I’m truly stuck here folks – any help would be soooo appreciated.

This is the code I’m using (from above codex page)

<h2><?php _e('New at SAGF'); ?></h2>
<?php // Get RSS Feed(s)
include_once(ABSPATH . WPINC . '/rss.php');
$rss = fetch_rss('https://strawberriesareglutenfree.com/feed/');
$maxitems = 5;
$items = array_slice($rss->items, 0, $maxitems);
?>

<ul>
<?php if (empty($items)) echo '<li>No items</li>';
else
foreach ( $items as $item ) : ?>
<li><a href='<?php echo $item['link']; ?>'
title='<?php echo $item['title']; ?>'>
<?php echo $item['title']; ?>
</a></li>
<?php endforeach; ?>
</ul>