The XML page cannot be displayed...

Problem

You get this error when running your application:

The XML page cannot be displayed.

Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

A name was started with an invalid character. Error processing resource 'http://localhost/MyApp1/...

<%@ Register Tagprefix="MyApp1" TagName="Header" Src="../Header & Footer/Header.ascx" %>

This error occurs when your Microsoft .NET Framework is not properly installed, not properly configured or not registered with the Microsoft IIS web server.

Solution

See ASPX (HTML) is Displayed Instead of Your Application for details on how to install and configure (re-register) the Microsoft .NET Framework.