Dependency Injection with MVVM pattern in Simple WPF Application

I’ve been trying to follow the advice in this answer

The problem is I get the error: No matching constructor found on type ‘FreecycleFrontEnd.MainWindow when the application starts up

Code below:

public partial class App : Application
    {
        private static readonly Logger log = LogManager.GetCurrentClassLogger();
        private IKernel container;


    protected override void OnStartup(StartupEventArgs e)
    {
        log.Debug("Application Starting Up");

        IocKernel.Initialize(new IocConfiguration());
        base.OnStartup(e);
       

    }

}
public partial class MainWindow : Window
{
    private IWebController _controller;
    public MainWindow(IWebController controller)
    {
        this._controller = controller;
        InitializeComponent();
        Loaded += onLoaded;
    }

 public class IocConfiguration : NinjectModule
{
    public override void Load()
    {

        Bind<IWebController>().To<WebController>().InSingletonScope();
        Bind<UserControlViewModel>().ToSelf().InTransientScope(); // Create new instance every time
    }
}
public static class IocKernel
{
    private static StandardKernel _kernel;

    public static T Get<T>()
    {
        return _kernel.Get<T>();
    }

    public static void Initialize(params INinjectModule[] modules)
    {
        if (_kernel == null)
        {
            _kernel = new StandardKernel(modules);
        }
    }
}

The code compiles, and executes up to base.OnStartup(e);
The Ninject configuration executes.

What have I missed?