I am using the following code for the lightbox
<a title="Fly2Buy Promotional Video" href="http://www.youtube.com/watch?v=d6JVRnw6sKQ?width=800&height=660" rel="wp-video-lightbox" width="600"><img class="aligncenter" src="http://www.webrevmarketing.com/wp-content/uploads/2012/11/betty-thumb.png" alt="" /></a>
But I am getting an error message when I click on the image to open the lightbox saying "Image cannot be loaded. Make sure the path is correct and image exist.", then when I click okay, it opens the video and will play it.