Cannot call 'start' of undefined when starting backbone.js history.

Question

I get Cannot call \'start\' of undefined when calling...

    Backbone.history.start()

When running some checks Backbone return

Answer 1

I hit the same error.

This happens when you do not make an instance of the router:

var routerInstance = new blogRouter();

Answer 2

Make sure you include jQuery.js before underscore.js and backbone.js in HTML head.