Failed to load resource: the server responded with a status of 404 on Facebook Instant Game

Question

I'm developing a Facebook Instant Game using HTML5 and am having trouble loading the css and JavaScript files linked on the index.html page, it is showing

"Failed to load resource: the server responded with a status of 404"

on the chrome console Is this a question of permissions or what am I missing? all files are on the root. Take a look at the image here you can see the console errors.

Answer 1

So I figured out what the problem is. I had the following html element on the header:

<base href="/">

Changing it to

<base href="">

will do the trick!