Problem with my mod.. Error CS1061

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;

namespace Apocalypse.Items.Projectiles
{

    public class RSProjectile : ModProjectile
    {
        public override void SetDefaults()
        {
            projectile.name = "RSProjectile";
            projectile.width = 20;      
            projectile.height = 28;...