SharePoint Page Layout Error: Only Content controls are allowed directly in a content page that contains Content controls

Dont put comments outside ASP:Content blocks

refer below post

http://blogs.msdn.com/b/saurabhkv/archive/2009/10/13/sharepoint-page-layout-error-only-content-controls-are-allowed-directly-in-a-content-page-that-contains-content-controls.aspx