Handheld.PlayFullScreenMovie, won't work?!

strangely enough, actually it is working when the first time I try, and then BOOM! not working anymore!!


just that simple, I attached the script to that button, and when it clicks the button turns red, but no video is playing! not even a sound! it did work once, but why the second time it won’t work?!

I’m using Unity Pro.

and…OK …
it has been solved.
when I remove the “.mp4” in video file’s name …
thank you, Unity!