mscorlib version conflict during build

Question

On a new Win8.1 reinstall, with all of my code restored from backup, I\'m suddenly now getting a Visual Studio warning when I build the main project of my solution:

Answer 1

I was able to fix this by issuing an update-package -reinstall command at the Package Manager Console.

BUT

Be careful, updating all the packages in your solution could cause other problems, make sure you can roll back to a good version if it goes wrong!