title: Unknown definition for dependency : Ext.grid.Panel - How to add it?
body: <p>I'm trying to create a simple grid in my sencha project that extends 'Ext.grid.Panel'.</p>
  
  <p>When I make from sencha cmd the "sencha app build" command, I have the exception: "Unknown definition for dependency : Ext.grid.Panel".</p>
  
  <p>Actually I don't have it in my sencha folder, so how can I add it?</p>
  
  <p>Thanks in advance</p>