Which version of Mathematica are you running?
To find out, evaluate $Version. If you're not running the latest version, I would suggest trying to install the latest version.
I'm using 10.0 for Microsoft Windows (64-bit) (June 29, 2014). Is that the latest version?
It worked for me... not a very informative image though....
The error that you got can come from a file that is not properly formatted JSON, which, of course, could be anything that is returned when, for example, an error web page is sent.
