[Plugin: Featured Video] Feature Video Not Working with theme

I have template #40346 from Template Monster the plugin is not displaying the video only a image box. I review a previous post that mention to add the following code to the single.php file. However when I add the code a error is listed.

<?php

if( has_post_video() ){
the_post_video()
}

?>

Can anyone please assist me with my problem. Thanks

https://www.ads-software.com/extend/plugins/featured-video/