Talking about ‘Master Page cannot be loaded’ Error : SharePoint – Design and Customization : SharePoint Products a

What was the Error.
I renamed my web site home page master.  When I tried to edit a page layout I got a red error in SharePoint Designer Design view that "This XXX Master page can not be loaded.  Change the master page or fix the error in code view"
How to FIX this kind of thing.
Point to Rember : Always go to Master Page Selection page and select the Renamed master page 🙂