File not found (404 error)

I am trying to add videos to the WordPress Replay premium theme. Whenever I upload (preference at this point) or paste the YouTube embed link, save and view video, it says:

!
File not found (404 error)
If you think what you’re looking for should be here, please contact the site owner.

How can I fix this?

http://autonomypublishing.com/oneshotonetakes.com/