Need help with mod error

using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
using Terraria.GameContent.Generation;
using Terraria.World.Generation;

namespace BloodForTheBloodGod
{
    public class BloodWorld : ModWorld
    {
        public override void ModifyWorldGenTasks(List<GenPass> tasks, ref float totalWeight)
        {
                int ShiniesIndex = tasks.FindIndex(genpass => genpass.Name.Equals("Shinies"));
            if(ShiniesIndex != -1)
            {...