Erreur lors du démarrage de Visual Studio 2012

J'obtiens un message d'erreur à chaque fois que je lance Visual Studio. Depuis, je vois aussi certains comportement inexpliqué dans mon projet, j'aimerais résoudre ce problème.

Message D'Erreur

Une exception a été rencontrée. Cela peut être causé par une extension.

Vous pouvez obtenir plus d'informations en examinant le fichier 'C:\Users\Jonathan\AppData\Roaming\Microsoft\VisualStudio\11.0\ActivityLog.xml'.

Quand je regarde le fichier de log, je trouve deux exceptions:

Erreur 1

Exception Type       : System.Windows.Markup.XamlParseException
Exception Message    : Provide value on 'System.Windows.StaticResourceExtension' threw an exception.
Exception Stack Trace:
    at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
    at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
    at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
    at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
    at SquaredInfinity.VSCommands.UI.Views.DefaultAlertView.InitializeComponent()
    at SquaredInfinity.VSCommands.Foundation.Services.VSCUIService.GetDefaultAlertViewModel(String alertMessage, String alertDialogTitle)
    at SquaredInfinity.Foundation.Presentation.Services.UIService.GetDefaultAlertViewModel(String alertMessage)
    at SquaredInfinity.Foundation.Presentation.Services.UIService.ShowAlert(String message)
    at SquaredInfinity.VSCommands.VSCommandsPackage.Initialize()
Exception Data   : [EmptyOrNull]
Inner Exception:
Exception Type       : System.Exception
Exception Message    : Cannot find resource named 'VSC.Button'. Resource names are case sensitive.
Exception Stack Trace:    at System.Windows.StaticResourceExtension.ProvideValueInternal(IServiceProvider serviceProvider, Boolean allowDeferredReference)
                      at System.Windows.StaticResourceExtension.ProvideValue(IServiceProvider serviceProvider)
                      at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CallProvideValue(MarkupExtension me, IServiceProvider serviceProvider)
Exception Data   : [EmptyOrNull]

Erreur 2

System.ComponentModel.Composition.CompositionException: The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.

1) The current type,    SquaredInfinity.Foundation.Configuration.Services.IConfigurationService, is an interface and cannot be constructed. Are you missing a type mapping?
Resulting in: Resolution of the dependency failed, type = "SquaredInfinity.Foundation.Configuration.Services.IConfigurationService", name = "(none)".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, SquaredInfinity.Foundation.Configuration.Services.IConfigurationService, is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception, the container was:
  Resolving SquaredInfinity.Foundation.Configuration.Services.IConfigurationService,(none)

Resulting in: An exception occurred while trying to create an instance of type '#Btb.#Rtb'.

Resulting in: Cannot activate part '#Btb.#Rtb'.
Element: #Btb.#Rtb -->  #Btb.#Rtb

Resulting in: Cannot get export '#Btb.#Rtb (ContractName="Microsoft.VisualStudio.Text.Classification.IClassifierProvider")' from part '#Btb.#Rtb'.
Element: #Btb.#Rtb (ContractName="Microsoft.VisualStudio.Text.Classification.IClassifierProvider") -->  #Btb.#Rtb

   at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)
   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(CatalogPart part, ExportDefinition export, Boolean isSharedPart)
   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore()
   at System.ComponentModel.Composition.Primitives.Export.get_Value()
   at System.ComponentModel.Composition.ExportServices.GetCastedExportedValue[T](Export export)
   at System.ComponentModel.Composition.ExportServices.<>c__DisplayClass4`2.<CreateStronglyTypedLazyOfTM>b__1()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InvokeMatchingFactories[TExtensionInstance,TExtensionFactory,TMetadataView](IEnumerable`1 lazyFactories, Func`2 getter, IContentType dataContentType, Object errorSource)

Comment dois-je interpréter ce que je puisse comprendre l'erreur?