VS2012-2013 Stopped Working

[coderfin]

The following log was created after installing the extension in VS2013:

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 export 'Microsoft.VisualStudio.Text.Classification.Implementation.ClassificationTypeRegistryService (ContractName="Microsoft.VisualStudio.Text.Classification.IClassificationTypeRegistryService")' is not assignable to type 'Microsoft.VisualStudio.Text.Classification.IClassificationTypeRegistryService'. Resulting in: Cannot set import 'AccentFontClassifier.AccentFontClassifierProvider.ClassificationRegistry (ContractName="Microsoft.VisualStudio.Text.Classification.IClassificationTypeRegistryService")' on part 'AccentFontClassifier.AccentFontClassifierProvider'. Element: AccentFontClassifier.AccentFontClassifierProvider.ClassificationRegistry (ContractName="Microsoft.VisualStudio.Text.Classification.IClassificationTypeRegistryService") --> AccentFontClassifier.AccentFontClassifierProvider Resulting in: Cannot get export 'AccentFontClassifier.AccentFontClassifierProvider (ContractName="Microsoft.VisualStudio.Text.Classification.IClassifierProvider")' from part 'AccentFontClassifier.AccentFontClassifierProvider'. Element: AccentFontClassifier.AccentFontClassifierProvider (ContractName="Microsoft.VisualStudio.Text.Classification.IClassifierProvider") --> AccentFontClassifier.AccentFontClassifierProvider 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__DisplayClass11_02.<CreateStronglyTypedLazyOfTM>b__1()
 at System.Lazy1.CreateValue() at System.Lazy1.LazyInitValue()
 at System.Lazy1.get_Value() at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InvokeMatchingFactories[TExtensionInstance,TExtensionFactory,TMetadataView](IEnumerable1 lazyFactories, Func2 getter, IContentType dataContentType, Object errorSource)