title: Ext.getStore() creating error: Uncaught TypeError: undefined is not a function
body: <p>I am creating a <em>ListView</em> and populating it with some data from a store that I have created.</p>
  
  <p>When I am assigning the store to the listview using 
  <code>store : Ext.getStore('Feeds')</code>, I get an error : </p>
  
  <blockquote>
    <p>Uncaught TypeError: undefined is not a function</p>
  </blockquote>
  
  <p><strong>View class:</strong></p>
  
  <pre><code>Ext.define('Volt.view.FeedView', {
      extend: 'Ext.Panel',
  
      requires: [
          'Ext.TitleBar',
          'Ext.Button',
          'Ext.Toolbar'
          //'Ext.Panel'
      ],
  
      xtype: 'feedViewCard',
  
      config: {
          iconCls: 'action',
          title: 'FeedView',
          layout: {
              type: 'vbox'
          },
          items: [
              {
                  xtype: 'feedlistview', // this is defined as a class that inherits from xtype = list
                  store: Ext.getStore('Feeds'), //removing this line gives no error
                  flex: 1,
                      }
                  }
              }
          ]
      },
  });
  </code></pre>
  
  <p><strong>Stores class</strong></p>
  
  <pre><code>Ext.define("Volt.store.Feeds", {
      extend: "Ext.data.Store",
      requires: "Ext.data.proxy.LocalStorage",
      config: {
          model: "Volt.model.Feed",
          data: [
              { title: "Feed 1", narrative: "narrative 1" },
              { title: "Note 2", narrative: "narrative 2" },
              { title: "Note 3", narrative: "narrative 3" },
              { title: "Note 4", narrative: "narrative 4" },
              { title: "Note 5", narrative: "narrative 5" },
              { title: "Note 6", narrative: "narrative 6" }
          ],
          sorters:[
              {
                  property: 'dateCreated',
                  direction: 'DESC'
              }
          ]
      }
  });
  </code></pre>
  
  <p><strong>Model Class</strong></p>
  
  <pre><code>Ext.define("Volt.model.Feed", {
      extend: "Ext.data.Model",
      config: {
          idProperty: 'id',
          fields: [
              { name: 'id', type: 'int' },
              { name: 'dateCreated', type: 'date', dateFormat: 'c' },
              { name: 'title', type: 'string' },
              { name: 'narrative', type: 'string' }
          ],
          validations: [
              { type: 'presence', field: 'id'},
              { type: 'presence', field: 'dateCreated'},
              { type: 'presence', field: 'title', 'message': 'Enter a valid title'}
          ]
      }
  });
  </code></pre>