I'm Stock! need help

Hello guys, I have just recently started working on the 4th d3 project called " D3 Choropleth",
after completed the other 3.

I am having an issue with the doc, it not working, here is the link: http://datamaps.github.io/

I don’t know if the mistake is from me, did as I read, yet could not get any Map render.
Pls any help will be appreciated…