10 May 2012 8:18 PM #11
This is due to
Use jsonP proxy
Sencha Designer Development Team
11 May 2012 4:32 AM #12
Enable CORS in server side script for Sencha touch
Cross-Origin Resource Sharing(CORS)
A relatively new capability of modern browsers is called CORS, which stands for Cross-Origin Resource Sharing. This allows you to send requests to other domains without the usual security restrictions enforced by the browser. Sencha Touch 2 has support for CORS, though you'll probably need to do a little setup on your web server to enable it.
Please read this Doc for How to enable CORS on Server side Script (Enable CORS).