the name " does not exist in current context.

help? the name eh does not exist in current context?

using UnityEngine;
using System.Collections;

public class PlayerAttack : MonoBehaviour {
	public GameObject target;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		if (Input.GetKeyUp(KeyCode.F)) {
			Attack();
		}
	
	}

	private void Attack() {
		EnemyHealth enemyhealth = (EnemyHealth)target.GetComponent ("EnemyHealth");
		eh.AdjustCurrentHealth(-10);
	}
}

wait dont worry i got it