GetMethod() returning null

Given the following code why is method variable null?

        Type[] typeArgs = { typeof(SomeClass) };
        var listRef = typeof(List<>);
        var list = Activator.CreateInstance(listRef.MakeGenericType(typeArgs));
        var method = list.GetType().GetMethod("Add‌​", BindingFlags.Default, null, typeArgs, null);

I have tried many different overloads and BindingFlags but still never get the MethodInfo for List<SomeClass>.Add(SomeClass item).

Surely it is something simple I am missing, but any help would be appreciated.