function.file-get-contents error

Warning: file_get_contents(http://www.goodreads.com/review/list_rss/6942113-bruno-cunha.xml?key=3mVq2aLmYmh0GlFVVlKrwQ&v=2&shelf=currently-reading&sort=date_started&per_page=2&order=d) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.1 502 Bad Gateway in /home/bcunha/public_html/blog/wp-content/plugins/booktuner/booktuner.php on line 178

I’m getting the error below on my Blog. Is there any one who can help?

http://wordpress.org/extend/plugins/booktuner/