Errors when running the default maps

[LaurentDumont]

Hey guys,

I was looking into setting up the map but I've run into some issues running the setup. Both in Chrome and Firefox, I've gotten the following errors :

Uncaught TypeError: Cannot set property 'innerHTML' of null in Chrome
TypeError: canvas is null in Firefox

The data.json is there and does contain some test data that should display something. I'm running python 2.7.9 and starting everything with : python -m SimpleHTTPServer in a bog standard venv. Not sure if I'm missing some critical piece somewhere...

Thanks!