error CS0103: The name `yourCharacter' does not exist in the current context

I trying to apply damage to the health bar . I got one error. Here is my script :

using UnityEngine;
using System.Collections;
using Opsive.ThirdPersonController.Wrappers;

public class Damage : MonoBehaviour {
int health;
Healthbar healthbar;


	void Start () {
	yourCharacter.GetComponent<Health>.CurrentHealth.
	healthbar = FindObjectOfType<Healthbar>();
	if (healthbar == null)
	{
		Debug.LogError("I am hit!");
	}

	}
	

	void Update () {
	
	}
}

What is yourCharacter? This line-

yourCharacter.GetComponent<Health>.CurrentHealth.
     healthbar = FindObjectOfType<Healthbar>();

does not make any sense because the script has no idea what yourCharacter is. You have not declared it anywhere in this script.