Script cant be applied to prefab?

Unity Engine
1

So I am making basic tiles on a plane and am trying to get the following script to apply to the prefab of the tiles:
using UnityEngine;
public class MouseOverTile : MonoBehaviour
{
public Color highlightColor;
Color normalColor;
void Start()
{
normalColor = GetComponent().material.color;
}

// Update is called once per frame
void Update()
{
Ray ray = GetComponent().ScreenPointToRay(Input.mousePosition);
if (GetComponent().Raycast(ray))
{
GetComponent().material.color = highlightColor;
}
else
{
GetComponent().material.color = normalColor;
}
}
}

However it wont work, what is wrong?

2

using UnityEngine;
using System.Collections;

public class MouseOverTile : MonoBehaviour {

public Color highlightColor;
Color normalColor;

// Use this for initialization
void Start() {
normalColor = GetComponent().material.color;

}

// Update is called once per frame
void Update() {
Ray ray = GetComponent().ScreenPointToRay(Input.mousePosition);
RaycastHit hitInfo;

if (GetComponent().Raycast(ray, out hitInfo))
{
GetComponent().material.color = highlightColor;
}

else
{
GetComponent().material.color = normalColor;
}
}
}

fixed many issues but the .Raycast function isnt right how to fix?