Dec 2014 :
Cross-Origin XMLHttpRequest error:

You might see this error if the included index.html demo page is opened offline in a browser. This product must be hosted on a server in order to prevent this error. After all, this product is not meant for offline use

Solution: Please upload the package to a web server. Then access the index.html via Chrome. It should work that way.

Reason: This is a security feature of Chrome that prevents a web page from accessing user’s “local” data directly.