Ninject error in WebAPI 2.1 - Make sure that the controller has a parameterless public constructor

Question

I have the following packages and their dependencies installed in my WebAPI project:

Ninject.Web.WebApi Ninject.Web.WebApi.OwinHost

Answer 1

For me, what caused this error was that for the interface I was passing into the constructor, I had a named binding and I called it with the wrong name. As you can see the below, the binding says it's named "Warehouse", but I got things mixed up and put "DataWarehouse" in the constructor. Getting this straightened out caused the error about a parameterless constructor to go away.

private static void RegisterServices(IKernel kernel)
    {
        kernel.Bind().To().InThreadScope();
        kernel.Bind().To().InThreadScope();
        kernel.Bind().To().Named("Warehouse").WithConstructorArgument("connectionString", ConfigurationManager.ConnectionStrings["DataWarehouse"].ConnectionString);
    }

constructor:

//WRONG NAME
public VisitProcessor([Named("DataWarehouse")] IDbConnectionFactory connection)
    {
        _database = connection;
    }