I am trying to make a small app to learn how Backbone works. I took example app from source called Todo. I have created my app from scratch using snippets from Todo app. I think these apps look very similar but for some reason I can't make work some things that work fine in the example app. I get an error:

A 'url' property or function must be specified

The other problem is that I can't make this code from the example work:

this.model.bind('change', this.render);

It says there is no such a function as bind. I checked all libraries versions and code and can't realize what I do wrong. What can I do about this?