JSONP Callback not working?

I'm attempting to setup a connection using JSONP and Jquery, and am recieving an "invalid label" error. This is usually pertaining to the server side no setup for callback.

Is anyone else having problems with this? I'm using the same code for the WOW API just with new url, and it's not working. IF you AREN'T having any problem, do you mind posting a snippet of your code showing how you can pull battletag heroes? I can work it out from there if I can see how people are doing this.