Missing type/namespace in ASP.NET Core MVC

I've created an empty ASP.NET Core Mvc project in visual studio for Mac, added a few dependencies

• Microsoft.AspNetCore.Mvc (1.1.2)
• Microsoft.AspNetCore.Mvc.Core (1.1.2)

and also imported the namespaces. However, when I create a new 

HomeController

Controller

publicclassHomeController:Controller

I get a red squiggle line and an error:

the type of namespace name 'Controller' could not be found".  Here is the image http://imgur.com/a/Ntpjm