I get an error like this in navcontrolle.cs?

Oct 26, 2015 at 6:58 PM
Severity Code Description Project File Line
Error CS0246 The type or namespace name 'IProductRepository' could not be found (are you missing a using directive or an assembly reference?) SportsStore.WebUI C:\Users\sbabadag\Documents\Visual Studio 2015\Projects\SportsStore\SportsStore.WebUI\Controllers\NavController.cs 15