MainPage.xaml file not loading properly in Visual Studio 2010 - visual-studio-2010

I am trying to workout with silver light in Visual Studio 2010 Professional. I have installed SilverLight SDK 4 as Visual Studio says, as the SDK 5 requires SP1.
After this installation i successfully created a SilverLight Applicatioin. But when I load MainPage.xaml file, it was showing exception. I refresh it, re-create the project but nothing works.
System.NullReferenceException
Object reference not set to an instance of an object.
at Microsoft.Windows.Design.Platform.SilverlightMetadataContext.SilverlightXamlExtensionImplementations.<GetXmlNamespaceCompatibilityMappings>d__8.MoveNext()
at MS.Internal.Design.Metadata.ReflectionProjectNode.BuildSubsumption()
at MS.Internal.Design.Metadata.ReflectionProjectNode.SubsumingNamespace(Identifier identifier)
at MS.Internal.Design.Markup.XmlElement.BuildScope(PrefixScope parentScope, IParseContext context)
I am new to SilverLight so i have no idea what is going on.
Any help would be great!

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