No exports were found that match the constraint contractname
Issue can be solved this problem by clearing Visual Studio Component Model Cache. Just delete or rename this folder: %LocalAppData%\Microsoft\VisualStudio\11.0\ComponentModelCache or %LocalAppData%\Microsoft\VPDExpress\11.0\ComponentModelCache and restart Visual Studio. The version of Visual Studio you have is specified by the number e.g. Visual Studio 2012 is 11.0 (as shown above) Visual Studio 2013 is 12.0 Visual Studio 2015 is 14.0 Visual Studio 2017 is 15.0 For those that don't know: %LocalAppData%\ is the same as C:\Users\{yourUsername}\AppData\Local