CreateDelegate type cannot be null

I have a C# desktop app.

It uses reflection to late bind to a DLL

This is my code:

class myClass
{
    //module declarations:

    public static event delMotionDiscovered evMotionDiscovered;
    public delegate void delMotionDiscovered(int camIndex);
    public static Type Core = null;

    void myfunction()
    {
        Assembly program = Assembly.Load(bytes);
        Core = program.GetType("InformedMotion.Engine.Core");
        var flags = BindingFlags.Static | BindingFlags.Public;

        evMotionDiscoveredDynamic = Core.GetEvent("evMotionDiscovered", flags);
        delMotionDiscoveredDynamic = Delegate.CreateDelegate(evMotionDiscoveredDynamic.EventHandlerType, null, "evMotionDiscovered");
        evMotionDiscoveredDynamic.AddEventHandler(null, delMotionDiscoveredDynamic);
    }
}

It errors on 'CreateDelegate with Target value cannot be null.

I did this work at some stage as well...