Application can't scaffold items

Question

I created an MVC 5 application in VS 2013 Professional and then used EF 6.1 code first with an existing DB on SQL Server Express. When I try to create the views I’m using th

Answer 1

I had the same error message. I tried adding a new Data context class from the Add Controller dialog, and then I got a different error:

There was an error running the selected code generator:
'Sections must only appear once per config file. See the help topic
 for exceptions.

It turns out that I had two elements in my web.config file. (I had pasted one from the app.config of the class library that contained my Entity Framework model.)