Intellisense could not be initialized due to the following error: System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedXmlnsDefinitionMap.AddNamespace(IAssembly assembly, IXmlNamespace xmlNamespace, String clrNamespace) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Platform.Wpf.WpfXmlnsDefinitionMap.RegisterAssemblyNamespaces(IAssembly assembly, IEnumerable1 attributes)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedXmlnsDefinitionMap.RegisterAssemblies(IEnumerable1 referencedAssemblies) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Platform.Wpf.WpfPlatformMetadata.CreateXmlnsDefinitionMap(ManagedTypeResolver typeResolver) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedPlatformMetadata.Reset() at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedPlatformMetadata.Initialize(ITypeResolver typeResolver) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedTypeResolverService.GetTypeResolver(IHostProject hostProject) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlFileInformationService.CreateFileInformationContext(IHostSourceItem sourceItem) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlLanguageService.EnsureBufferCache(IVsTextLines textLines) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlLanguageService.CreateSource(IVsTextLines textLines) Intellisense could not be initialized due to the following error: System.ArgumentException: An item with the same key has already been added. at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedXmlnsDefinitionMap.AddNamespace(IAssembly assembly, IXmlNamespace xmlNamespace, String clrNamespace)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Platform.Wpf.WpfXmlnsDefinitionMap.RegisterAssemblyNamespaces(IAssembly assembly, IEnumerable1 attributes) at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedXmlnsDefinitionMap.RegisterAssemblies(IEnumerable1 referencedAssemblies)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Platform.Wpf.WpfPlatformMetadata.CreateXmlnsDefinitionMap(ManagedTypeResolver typeResolver)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedPlatformMetadata.Reset()
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedPlatformMetadata.Initialize(ITypeResolver typeResolver)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.Metadata.ManagedTypeResolverService.GetTypeResolver(IHostProject hostProject)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlFileInformationService.CreateFileInformationContext(IHostSourceItem sourceItem)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlLanguageService.EnsureBufferCache(IVsTextLines textLines)
at Microsoft.VisualStudio.DesignTools.Xaml.LanguageService.XamlLanguageService.CreateSource(IVsTextLines textLines)