The controller for path was not found or does not implement IController

Question

I have an MVC4 project with language selection:

• en
• nl
• fr
• de

1 main part with:

• About
• Common (fo

Answer 1

In my case in global.asax/application_start method, I was registering web api routes AFTER mvc routes like so:

RouteConfig.RegisterRoutes(RouteTable.Routes);
GlobalConfiguration.Configure(WebApiConfig.Register);

Reverting the order fixed the issue

GlobalConfiguration.Configure(WebApiConfig.Register);            
RouteConfig.RegisterRoutes(RouteTable.Routes);