Pause Menu script not working

So I have got a script here that is meant to open a pause menu but it comes up with an error whenever I put it in my game. I am relatively new to unity though so its probably an easy fix.

Here is the script.

using UnityEngine;
using System.Collections;
using UnityStandardAssets.Characters.FirstPerson;

public class PauseGame : MonoBehaviour {
public Transform canvas;

// Update is called once per frame
void Update () {
    if (Input.GetKeyDown(KeyCode.Escape))
    {
        Pause();
    }
}
public void Pause()
{
    if (canvas.gameObject.activeInHierarchy == false)
    {
        canvas.gameObject.SetActive(true);
        Time.timeScale = 0;
        Player.GetComponent<FirstPersonController>().enabled = false;
    }
    else
    {
        canvas.gameObject.SetActive(false);
        Time.timeScale = 1;
        Player.GetComponent<FirstPersonController>().enabled = true;
    }
}

}

Here is a picture as well

You have to make a reference stored in a separate variable to First Person Controller and get component to it, or make this variable “static”. You can do this:

Change
Player.GetComponent (FirstPersonController) ().enabled = false;

to
GameObject.FindGameObjectWithTag (“Player”).GetComponent (FirstPersonController) ().enabled = false;

Of course change parenthesis around FirstPersonController phrase to “sharp”.

Then in hierarchy click First Person Controller and from inspector select “Player” tag.

By the way, C# isn’t good for beginners. Consider changing to JavaScript. Is much simpler.