using System

Code:
using System;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
namespace HarvestReaper.Items.Weapons
{
    public class HarvestReaper : ModItem

    {
        public override void SetStaticDefaults()

        {
            DisplayName.SetDefault("Harvest Reaper");
            Tooltip.SetDefault("The Jack o' Reaper's Scythe");
        }

        public override void SetDefaults()

        {
            item.useStyle = 1;
            item.melee = true;
            item.useAnimation = 30;
            item.damage = 160;
            item.knockBack = 5;
            item.autoReuse = true;
            item.useTurn = true;
            item.crit = 20;
            item.width = 80;
            item.height = 80;
            item.scale = 0.75f;
            item.value = 1000000;
            item.rare = 8;
            item.stack = 1;
        }

        public override void AddRecipes()
        {
            ModRecipe recipe = new ModRecipe(mod);
            recipe.AddIngredient(ItemID.TheHorsemansBlade, 1);
            recipe.AddIngredient(ItemID.LunarBar, 999);
            recipe.SetResult(this);
            recipe.AddRecipe();
        }

        public override void OnHitNPC(Player player, NPC target, int damage, float knockBack, bool crit)

        {
            Projectile.NewProjectile(target.position.X, target.position.Y, 0, 0, item.shoot, item.damage, item.knockBack, item.owner, target.whoAmI, 0f);

            int numProjectiles2 = 3;
            float spread = MathHelper.ToRadians(10);
            float baseSpeed = (float)Math.Sqrt(75 * 75 + 75 * 75);
            double startAngle = Math.Atan2(75, 75) - spread / 2;
            double deltaAngle = spread / (float)numProjectiles2;
            double offsetAngle;

            Random randomSeed = new Random();

            for (int j = 0; j < numProjectiles2; j++)
            {
                int[] negPos = { -1, 1 };
                int posX = npc.position.X + randomSeed.Next(1000, 1500) * negPos[randomSeed.Next(2)];
                int posY = npc.position.Y + randomSeed.Next(1000, 1500) * negPos[randomSeed.Next(2)];
                offsetAngle = startAngle + deltaAngle * j;
                Projectile.NewProjectile(position.X, position.Y, baseSpeed * (float)Math.Sin(offsetAngle), baseSpeed * (float)Math.Cos(offsetAngle), type, damage, knockBack, player.whoAmI);
            }
        }
    }
}



Errors:
c:\Users\Legen\Documents\My Games\Terraria\ModLoader\Mod Sources\HarvestReaper\Items\Weapons\HarvestReaper.cs(63,28) : error CS0103: The name 'npc' does not exist in the current context

c:\Users\Legen\Documents\My Games\Terraria\ModLoader\Mod Sources\HarvestReaper\Items\Weapons\HarvestReaper.cs(64,28) : error CS0103: The name 'npc' does not exist in the current context

c:\Users\Legen\Documents\My Games\Terraria\ModLoader\Mod Sources\HarvestReaper\Items\Weapons\HarvestReaper.cs(66,42) : error CS0103: The name 'position' does not exist in the current context

c:\Users\Legen\Documents\My Games\Terraria\ModLoader\Mod Sources\HarvestReaper\Items\Weapons\HarvestReaper.cs(66,54) : error CS0103: The name 'position' does not exist in the current context

c:\Users\Legen\Documents\My Games\Terraria\ModLoader\Mod Sources\HarvestReaper\Items\Weapons\HarvestReaper.cs(66,150) : error CS0103: The name 'type' does not exist in the current context