title: A 'url' property or function must be specified error in Backbone.js
body: <p>I am trying to make a small app to learn how Backbone works. I took example app from source called <a href="http://documentcloud.github.com/backbone/examples/todos/index.html" rel="noreferrer">Todo</a>. 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:</p>
  
  <pre><code>A 'url' property or function must be specified
  </code></pre>
  
  <p>The other problem is that I can't make this code from the example work:</p>
  
  <pre><code>this.model.bind('change', this.render);
  </code></pre>
  
  <p>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?</p>