I just started modding and this error came up "item does not contain definition for name and tooltip"

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Steam

I just started modding a week ago so im just following tutorials so i don't know whats wrong! can you help me? The error is "Item does not contain definition for name and tooltip"
Here's my code!



using Terraria.ID;
using Terraria.ModLoader;

namespace TheGunMod.Items.Weapons
{
public class BoulderBullet : ModItem
{
public override void SetDefaults()
{
item.name = "BoulderBullet";
item.damage = 200;
item.ranged = true;
item.width = 8;
item.height = 8;
item.maxStack = 999;
item.toolTip = "The Evil Boulder Has Been Caught";
item.consumable = true;
item.knockBack = 1.5f;
item.value = 10;
item.rare = 2;
item.shoot = mod.ProjectileType("BoulderBullet");
item.shootSpeed = 15f;
item.ammo = ProjectileID.Bullet;
}
public override void AddRecipes()
{

ModRecipe recipe = new ModRecipe(mod);
recipe.AddIngredient(ItemID.StoneBlock, 6);
recipe.AddTile(TileID.HeavyWorkBench);
recipe.SetResult(this, 20);
recipe.AddRecipe();
}
}
}

What I have tried:

I don't know how to start so I haven't tried anything!