Delete ReflectedSchemes folder in Classic .NET AppPool

Go to: How to Fix “Validation (): Element ‘xxxxx’ is not supported” Visual Studio 2010 (VWD 2010 Express)

You may need to also delete the 'ReflectedSchemes' folder within Users -> Classic .NET AppPool -> AppData -> Roaming -> Microsoft -> VisualStudio -> 9.0 folder, to fix "Validation (): Element 'xxxxx' is not supported" error for ASP.NET server controls within Visual Studio 2008.

Delete ReflectedSchemes folder in Classic .NET AppPool

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