Question Why is "type or namespace not found"

I am making a script that enables or disables the Unity Standard Assets FirstPersonController script on button click. I am getting the error "cs0246 the type or namespace FirstPersonController could not be found". I know that normally happens when you are missing a direcutive but the script is attacked to the same GameObject as the FirstPersonController script and im getting the error, have i dont something wrong?
heres my code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. public class StopMouse : MonoBehaviour
5. {
6.     // Update is called once per frame
7.     void Update()
8.     {
9.         if(Input.GetKeyDown(KeyCode.Tab))
10.         {
11.             GetComponent<FirstPersonController>().enabled = false;
12.         }
13.         else
14.         {
15.             GetComponent<FirstPersonController>().enabled = true;
16.         }
17.     }
18. }

 

Show us your

FirstPersonController

class.

If you don't have one then you have not gotten 100% of the code required to make the above code work.

If you just need a first person controller (NOT the same as the above, I'm talking a whole fresh start), here is a great simple starter one:

https://forum.unity.com/threads/a-basic-first-person-character-controller-for-prototyping.1169491/