Unity C# Script Error CS0201 ! Help me please !

This is my script for detect collision, but I can’t run the game because I have the error CS0201
Who can help me ???

using UnityEngine;
using System.Collections;

public class EnemyKill : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
	}
	void OnCollisionEnter (Collision kill){
		(kill.transform.tag="Enemy");

		{
			print ("I hit enemy");
		}
	}

}

change (kill.transform.tag="Enemy"); to if (kill.transform.tag == "Enemy")