give me video loading warning

hi
i am using cool video gallery 1.8 plugin
i have created gallery name
but i cant able to upload video from you tube
its give me error

Warning: simplexml_load_file(http://gdata.youtube.com/feeds/api/videos/http://www.youtube.com/watch?v=t4jZFOhIMZM) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in /home/desigyhw/public_html/wp-content/plugins/cool-video-gallery/lib/youtube.php on line 109

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity “http://gdata.youtube.com/feeds/api/videos/http://www.youtube.com/watch?v=t4jZFOhIMZM” in /home/desigyhw/public_html/wp-content/plugins/cool-video-gallery/lib/youtube.php on line 109

Fatal error: Call to a member function children() on a non-object in /home/desigyhw/public_html/wp-content/plugins/cool-video-gallery/lib/youtube.php on line 38

pls help me