title: callback is not a function error
body: <p>I am trying to pass a callback to a function, but keep getting the error, </p>
  
  <p><strong>Uncaught TypeError: callback is not a function.</strong></p>
  
  <pre><code>loadContacts: function () {
  
      var pageNumber = this.state.pageNumber,
          pageSize = this.state.pageSize;
  
      BasketService.getContacts(pageNumber, pageSize, function(contacts){
          contacts = this.convertPropertyNames(contacts);
  
          this.setState({
              contacts: contacts
  
          });
      }.bind(this));
  },
  
  // trying to pass function callback here
  listenerForRemoveContact: function(data){
          BasketService.removePerson(data.id, this.loadContacts());
  
  },
  </code></pre>