AI won't work and give error

Unity Engine
1

hello,

again i have a problem with an AI for a zombie, but i got this errors :
-Assets/scripts/AI_Zombie_Controller.cs(12,20): error CS1502: The best overloaded method match for `UnityEngine.Physics.Raycast(UnityEngine.Vector3, UnityEngine.Vector3, out UnityEngine.RaycastHit, float, int)’ has some invalid arguments

-Assets/scripts/AI_Zombie_Controller.cs(12,20): error CS1620: Argument #3' is missing out’ modifier

with this script :

using UnityEngine;
using System.Collections;

public class AI_Zombie_Controller : MonoBehaviour {

	public float turnspeed = 2;
	public float walkspeed = 3;
	public float distanceTOwall = 2;
	public RaycastHit hit;

	void Update () {
	if(Physics.Raycast(transform.position, transform.forward, hit, distanceTOwall, 0)){
			transform.Rotate(Vector3.up, 90 * turnspeed * Time.deltaTime);
			}
	else{
			transform.Rotate(Vector3.up ,-90 * turnspeed * Time.deltaTime);	
			}
	transform.Translate(Vector3.forward * walkspeed * Time.deltaTime);			
	}
}

i have found all ready that the problem seems to be in this line of code :

if(Physics.Raycast(transform.position, transform.forward, hit, distanceTOwall, 0)){

could some one explain me how to fix this

thanx

2

in C# you must include the “out” command

if(Physics.Raycast(transform.position, transform.forward, out hit, distanceTOwall, 0)){