Youtube in Lightbox error

Hi. I want to show youtube when open a lightbox. This is what I do.

[su_lightbox type=”iframe” src=”https://www.youtube.com/embed/YfpULoEZIHk” class=””]Click Here to Watch the Video [/su_lightbox]

But it doesn’t work. Please help.

https://wordpress.org/plugins/shortcodes-ultimate/