need help with a plugin

using Rocket.API;
using System.Collections.Generic;

namespace DropManager
{
    public class DropManagerConfiguration : IRocketPluginConfiguration
    {
        public bool ShowWarnings { get; set; }
        public string LeftOtherDrop { get; set; }

        public List<Item> Items { get; set; }

        public string BlackListIds { get; set; }

        public void LoadDefaults()
        {
            ShowWarnings = true;
            LeftOtherDrop = "100%";
            
            Items = new List<Item>
            {
                new Item("Skull Flag", 514, 1, 2),
            };

            BlackListIds = "47132, 58950, 41829";
        }
    }
}