Warning: simplexml_load_file

Hi,
I am unable to add videos – I get the following error
Warning: simplexml_load_file(http://gdata.youtube.com/feeds/api/videos/http://youtu.be/S7giNy7vdOo) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in /home/XXXXX/public_html/israelnews/wp-content/plugins/cool-video-gallery/lib/youtube.php on line 109

On my server – PHP extension SimpleXML : Enabled
and allow_url_fopen = On

Any idea?

http://ww.wp.xz.cn/plugins/cool-video-gallery/