Issue description :
No exports were found that match the constraint:ContractName
Microsoft.VisualStudio.Utilities.IContentTypeRegistryService
RequiredTypeIdentity
Microsoft.VisualStudio.Utilities.IContentTypeRegistryService
Solution : removing all the files from following visual studio ComponentModelCache folder
COMPONENT MODEL CACHE folder location : C:\Users\{YourUserName}\AppData\Local\Microsoft\VisualStudio\11.0\ComponentModelCache
