Unanswered: I cant Saving to the server
All codes are the extjs-4.0.7-gpl mvc example,users.json isn't read.
This is the second question you've asked where you've included almost no information. We can't help you if you don't give us a clear description of the problem. If you're struggling with English then you may need to ask a friend to help you post questions.
From the screenshot I would guess that you have a problem with either your fields configuration or the dataIndex values on your columns. It would help if you could post the code and a sample of your JSON.