Error CS0135 `eh' conflicts with a declaration in a child block

[Grpm]

Good day im having trouble indentifing where i redeclare the eh variable
what im trying too do is damage the enemy and the temporal workaround i found is to keep the declaration outside the if statement but i get a null exeption cause enemigo is not declared yet

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class TorretaAI : MonoBehaviour {

	public Transform BaseTorreta;
	public Transform Enemigo;
	public List<Transform> Enemigos = new List<Transform>();
	public float RotationSpeed = 1;
	public Rigidbody bulletPrefab;
	public Transform bulletSpawn;
	public float AttackSpeed;
	public float shotInterval = 0.5f;
	public float bulletSpeed = 500f;
	public float counter;
	public bool Timer = true;
	public float tiempo;
	public int Daño;
	private VidaEnemigo eh;

	// Use this for initialization
	void Start () {
		counter += Time.deltaTime;

	}

	void OnTriggerStay (Collider other){
		if (other.tag == "enemigo") {
			if (!Enemigos.Contains(other.transform)){
				Enemigos.Add(other.transform);
			}
			
		}
	}



	// Update is called once per frame
	void Update () {

		Enemigos.Sort(delegate(Transform t1, Transform t2){return Vector3.Distance(t1.position, BaseTorreta.position).CompareTo(Vector3.Distance(t2.position, BaseTorreta.position));});   

		if (Enemigos.Count > 0){
			Enemigo = Enemigos [0];
		}
						


		if (Enemigo){
			VidaEnemigo eh = (VidaEnemigo)Enemigo.gameObject.GetComponent ("VidaEnemigo");
			BaseTorreta.rotation = Quaternion.Slerp( BaseTorreta.rotation, Quaternion.LookRotation( Enemigo.transform.position - BaseTorreta.position ), Time.deltaTime * RotationSpeed );
			if (Time.time >= AttackSpeed)

			{ 
				Rigidbody bullet = Instantiate(bulletPrefab, bulletSpawn.position, bulletSpawn.rotation) as Rigidbody;
				bullet.rigidbody.AddForce(transform.forward * bulletSpeed);
				AttackSpeed = Time.time + shotInterval;
				if (counter >= tiempo){

					eh.AddjustCurrentHealth(-Daño);
					counter = 0;
				}
			}
		}

		if (eh.curHealth <= 0){

			Enemigo = null;
			Enemigos.RemoveAt(0);
		}
	}

	void OnTriggerExit (Collider other){
		if (other.tag == "enemigo") {
			if (Enemigos.Contains(other.transform)){
				Enemigos.Remove(other.transform);
			}

		}
	}
}

[dmg0600]

The problem is, in the if you are assigning the component VidaEnemigo to a new variable as you are declaring it there, thus it is not assigned to the variable declared in the line 22 before Start.

Just remove VidaEnemigo in the if:

if (Enemigo)
        {
            eh = (VidaEnemigo)Enemigo.gameObject.GetComponent("VidaEnemigo");
            BaseTorreta.rotation = Quaternion.Slerp(BaseTorreta.rotation, Quaternion.LookRotation(Enemigo.transform.position - BaseTorreta.position), Time.deltaTime * RotationSpeed);
            if (Time.time >= AttackSpeed)
            {
                Rigidbody bullet = Instantiate(bulletPrefab, bulletSpawn.position, bulletSpawn.rotation) as Rigidbody;
                bullet.rigidbody.AddForce(transform.forward * bulletSpeed);
                AttackSpeed = Time.time + shotInterval;
                if (counter >= tiempo)
                {

                    eh.AddjustCurrentHealth(-Daño);
                    counter = 0;
                }
            }
        }

Another comment, if you use GetComponent() instead of GetComponent(“VidaEnemigo”) you don’t have to cast it.

eh = Enemigo.gameObject.GetComponent<VidaEnemigo>();