Building game for facebook

I put in my app id in player settings and also put in upload access token. when ever i click upload lastbuild to facebook get an error. anyone tell me how to fix it or maybe i missed a step. been following youtube tutorial
Publish Unity3d App as webgl build to Facebook

I’d just upload it manually using the facebook web UI.

It has never ever succeeded for myself, it always errors.

How do u manually upload it to facebook

I figured out but when i go to the link for my app to play it, theres nothing there. Its blank.

I get The requested URL was not found on this server facebook app