C # script error CS1729.

Error CS1729: The type UnityEngine.Vector2 'does not contain a constructor That takes 1’ arguments

script:

using UnityEngine;
using System.Collections;

public class EnemyInseguePlayer : MonoBehaviour {

	public Transform player;
	public float playerDistance;
	public Vector2 playerXAxis;
	public float moveSpeed;


	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
		playerDistance = Vector3.Distance (player.position, transform.position);

		if(playerDistance < 15f)
		{
			LookAtPlayer ();
		}
		if(playerDistance < 12f)
		{
			chase ();
		}
	
	}

	void LookAtPlayer()
	{
		Vector2 playerXAxis;
		playerXAxis = new Vector2 ( player.position.x);
	}


	void chase()
	{
	      
		transform.Translate (Vector3.forward * moveSpeed * Time.deltaTime);
		}
	}

If you want to save the position in the X axis, use a float for playerXAxis.

playerXAxis = player.position.x;

If you want to save coords in a vector, you have to fill in the two parameters. For example, in line 36:

playerXAxis = new Vector2(player.position.x, player.position.y);