layermask does not exit in the context. What does this mean?

Here is my code:

using UnityEngine;
using System.Collections;

public class BlockPlaceExample : MonoBehaviour {
	
	public GameObject terrain;
	private PolygonGenerator tScript;
	public GameObject target;
	private LayerMask layerMaske = (1 << 0);
	
	// Use this for initialization
	void Start () {
		tScript = terrain.GetComponent ("PolygonGenerator") as PolygonGenerator;
	}
	
	// Update is called once per frame
	void Update () {
		
		RaycastHit hit;
		
		float distance = Vector3.Distance (transform.position, target.transform.position);
		
		if( Physics.Raycast(transform.position, (target.transform.position -
		                                         transform.position).normalized, out hit, distance , layerMask)){
			
			Debug.DrawLine (transform.position, hit.point, Color.red);
			
			Vector2 point= new Vector2(hit.point.x, hit.point.y);
			point+=(new Vector2(hit.normal.x,hit.normal.y))*-0.5f;
			
			tScript.blocks[Mathf.RoundToInt(point.x-.5f),Mathf.RoundToInt (point.y+5f)]=0;
			tScript.update=true;
			
			
		} else {
			Debug.DrawLine (transform.position,target.transform.position,Color.blue);
		}
	}
}

Here is my error: Assets/Scripts/BlockPlaceExample.cs(24,110): error CS0103: The name `layerMask’ does not exist in the current context

Here is the tutorial:

I’ve already used the complete code page as a reference.

On line 9, you misspell the variable by adding an extra ‘e’ making it ‘layerMaske’ instead of ‘layerMask’. When I have this error, I often copy and past variables from one reference to another to make sure they are absolutely the same.