A route named “x” is already in the route collection. Route names must be unique. Exception with ASP.NET MVC 3

Question

I\'m doing an ASP.NET MVC 3 web service and I keep getting this exception intermittently.

Stack trace:

Server Error in \'/\' Application.

A route n         


        

Answer 1

I was running an old MVC2 website and I got this issue because the IIS 'Managed Pipeline Mode' was set on 'Integrated' by default (press F4 on the project). Changing it to 'Classic' fixed the issue