An hour back I was working with ASP.NET and encountered with this pretty error. I kept wandering for about ten minutes what really has happened. My iisexpress.exe was automatically shut down and it didn’t work when I kept hitting CTRL+F5.
How I solved it:
Later i the process I came to know that I had the name for an Action was “View” that you can see in the picture below.
I renamed it to View1 and it worked again. Hope this helps somebody. Thanks!