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missing HtmlHead control which is required for the CSS stylesheet link

ValidatorCalloutExtender | System.NotSupportedException

I upgraded one of the ASP.NET Web applications from 1.0 to 3.5. Everything went smoothly. Then I tried to use the ValidatorCalloutExtender and received the errors shown below.

This page is missing a HtmlHead control which is required for the CSS stylesheet link that is being added. Please add <head runat="server" />.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotSupportedException: This page is missing a HtmlHead control which is required for the CSS stylesheet link that is being added. Please add .

 

Solution: include runat="server" in the head tag