Resolving “Validation (): Element ‘xxxx’ is not supported” warning in Visual Studio 2005/2008

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Delete the files from “C:\Documents and Settings[Username]\Application Data\Microsoft\VisualStudio\9.0\ReflectedSchemas” folder (or “…\VisualStudio\8.0\…” if running Visual Studio 2005) in Windows XP. In Windows 7 it is under “C:\Users{User Profile}\AppData\Roaming\Microsoft…etc”. Remember also the “VisualStudio” part of the path will be different depending on the version installed.

I closed Visual Studio (always a good idea for changes that will affect the IDE), deleted the files then re-opened the project. The warnings were gone.

I found references to this solution at:
http://forums.asp.net/t/1205528.aspx
http://blogs.msdn.com/mikhailarkhipov/archive/2005/04/21/410557.aspx

A quick Google search found the solution.
FYI, the search term I used in Google was “element is not supported”.

I don’t know why this happens but I do know there are some flaky domain profile things happening in the network environment.

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