error when using Sillverlight for the first time

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I tried to create my first application with silverlight
(http://samples.msdn.microsoft.com/Silverlight/SampleBrowser/index.htm#/?sref=WebcamCapture[^] )
after installing Silverlighttool-4 but it gives error:
---

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)   at MS.Internal.Design.Markup.XmlElement.ConvertToXaml(XamlElement parent, PrefixScope parentScope, IParseContext context, IMarkupSourceProvider provider)   at MS.Internal.Design.DocumentModel.DocumentTrees.Markup.XamlSourceDocument.FullParse(Boolean convertToXamlWithErrors)   at MS.Internal.Design.DocumentModel.DocumentTrees.Markup.XamlSourceDocument.get_RootItem()   at Microsoft.Windows.Design.DocumentModel.Trees.ModifiableDocumentTree.get_ModifiableRootItem()   at Microsoft.Windows.Design.DocumentModel.MarkupDocumentManagerBase.get_LoadState()   at MS.Internal.Host.PersistenceSubsystem.Load()   at MS.Internal.Host.Designer.Load()   at MS.Internal.Designer.VSDesigner.Load()   at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedView.Load()   at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedDesignerFactory.Load(IsolatedView view)   at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view)   at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view)   at MS.Internal.Host.Isolation.IsolatedDesigner.Load()   at MS.Internal.Designer.DesignerPane.LoadDesignerView()

Posted 3-Jan-12 3:44am

JawadHafiz

Updated 3-Jan-12 3:46am

Wendelius

v2

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Ganesan Senthilvel · Answer 1 · 2012-01-03T03:46:00

Solution 1

Uninstall the standard version of silverlight and then install the developer runtime and it will get solved. please install the silverlight developer runtime from this link: http://go.microsoft.com/fwlink/?LinkId=146060[^]

Posted 3-Jan-12 3:46am

Ganesan Senthilvel

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JawadHafiz 3-Jan-12 10:31am

i am having silverlight4 SDK and silverlight4 tools for visual studeo, Which one to be removed