[Plugin: Fetch Feed shortcode pageable] Fatal Error

I’m getting a fatal error:

Fatal error: Call to a member function get_items() on a non-object in /home/xxxxyyyy/public_html/blogs/wp-content/plugins/fetch-feed-shortcode-pageable/fetch-feed-shortcode-pageable.php on line 141

Any ideas?

http://wordpress.org/extend/plugins/fetch-feed-shortcode-pageable/