The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception

Question

I\'m working with EF5 in a MVC 4 aspnet website. Locally, everything works just fine, but when I publish it to the IIS and try to enter, I get the error

Answer 1

If you are maintaining one more cinfiguration file for app.config , Don't include any key in parent page.

Parent Page : app.config

Child Page : appSettings.config