I use a Windows 8 Virtual Machine for any Windows Phone 8 app development I do. I hadn’t fired up my VM for quite a while and there were a whole host of Windows updates to be installed.
After installing the updates and running Visual Studio 2012, I tried to load one of my Windows Phone App solutions. When trying to view any of the pages in Visual Studio, I received the error:
No exports were found that match the constraint:
Very annoying considering that before the updates were installed everything worked fine. To overcome the issue, what you can do is delete the folder ComponentModelCache, which can be found in this path:
C:\Users\<<user>>\AppData\Local\Microsoft\VisualStudio\11.0\ — where <<user>> is the users folder.
This has worked fine for me and looking at Google, has worked for many other people.