No suitable method found to override

c:\Users\Павел\Documents\My Games\Terraria\ModLoader\Mod Sources\Megalia\Items\E-core.cs(38,30) : error CS0115: 'Megalia.NPCs.Boss.Ecore.Boss(ref string, ref string)': no suitable method found to override

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

namespace Megalia.NPCs.Boss
{
    public class Ecore : ModNPC
    {
        public override void SetDefaults()
        {
            npc.name = "E-core";
            npc.displayName = "E-core";
            npc.aiStyle = 5;  //5 is the flying AI
            npc.lifeMax = 100;   //boss life
            npc.damage = 20;  //boss damage
            npc.defense = 10;    //boss defense
            npc.knockBackResist = 0f;
            npc.width = 100;
            npc.height = 100;
            animationType = NPCID.DemonEye;   //this boss will behavior like the DemonEye
            Main.npcFrameCount[npc.type] = 2;    //boss frame/animation 
            npc.value = Item.buyPrice(0, 40, 75, 45);
            npc.npcSlots = 1f;
            npc.boss = true;  
            npc.lavaImmune = true;
            npc.noGravity = true;
            npc.noTileCollide = true;
            npc.soundHit = 8;
            npc.soundKilled = 14;
            npc.buffImmune[24] = true;
            music = MusicID.Boss2;
            npc.netAlways = true;
        }
        public override void headTexture(ref string headTexture, ref string EcoreMapIcon)
        {
            EcorePapIcon = "Megalia/NPCs/Boss/E-coreMapIcon"; //the boss head texture
        }
        public override void bossLifeScale(ref string name, ref int potionType)
        {
            potionType = ItemID.LesserHealingPotion;   //boss drops
            Item.NewItem((int)npc.position.X, (int)npc.position.Y, npc.width, npc.height, mod.ItemType("YourSword"));
        }
        public override void ScaleExpertStats(int numPlayers, float bossLifeScale)
        {
            npc.lifeMax = (int)(npc.lifeMax * 0.579f * bossLifeScale);  //boss life scale in expertmode
            npc.damage = (int)(npc.damage * 0.6f);  //boss damage increase in expermode
        }
    }
}