How do I Play/Pause video which is a child of vuforia image target?

I have added using UnityEngine.Video; into all of the relevant scripts: DefaultTrackableEventHandler and the myButtonActivator script (which uses raycasting in vuforia and laptop GetButtonDown(KeyCode "") to activate different on-screen buttons).

Currently, the game will compile and on keypress "A" the GameObjects become active, but I get the error that "MissingComponentException: There is no 'VideoPlayer' attached to the "MainTarget" game object, but a script is trying to access it. You probably need to add a VideoPlayer to the game object "MainTarget". Or your script needs to check if the component is attached before using it. myButtonActivator.Update () (at Assets/myButtonActivator.cs:52)" I'm guessing this means that for some reason it thinks that the image target should play a video rather than its subobjects. Can anyone please point out how to correct this?

here is the myButtonActivator script:

using System; using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.Video;

public class myButtonActivator: MonoBehaviour { public GameObject CarUnroll; public GameObject CompUnroll; public GameObject KitchUnroll; public GameObject OvShpUnroll; public GameObject ScrollPlane; private string btnName; public VideoPlayer CarUnr; public VideoPlayer CompUnr; public VideoPlayer KitchUnr; public VideoPlayer OvShpUnr;

 void Awake()
 {
     CarUnr = GetComponent<VideoPlayer>();
     CompUnr = GetComponent<VideoPlayer>();
     OvShpUnr = GetComponent<VideoPlayer>();
     KitchUnr = GetComponent<VideoPlayer>();
 }

 // Start is called before the first frame update
 void Start()
 {
     CarUnroll.SetActive(false);
     CompUnroll.SetActive(false);
     KitchUnroll.SetActive(false);
     OvShpUnroll.SetActive(false);
     ScrollPlane.SetActive(false);
 }

 // Update is called once per frame
 void Update()
 {
     //Laptop key control//
     if (Input.GetKeyDown(KeyCode.A))
     {
         //turn off scroll & space
         ScrollPlane.SetActive(false);
         //turn on unroll
         CompUnroll.SetActive(true);
         CarUnroll.SetActive(true);
         KitchUnroll.SetActive(true);
         OvShpUnroll.SetActive(true);
     }
     if (Input.GetKeyDown(KeyCode.A) && CarUnr.isPlaying)
     {
         //Pause videoplayers
         CarUnr.Pause ();
         CompUnr.Pause ();
         KitchUnr.Pause ();
         OvShpUnr.Pause ();
     }
     if (Input.GetKeyDown(KeyCode.A) && CarUnr.isPaused)
     {
         //Play videoplayers
         CarUnr.Play();
         CompUnr.Play();
         KitchUnr.Play();
         OvShpUnr.Play();
     }
     if (Input.GetKeyDown(KeyCode.S))
     {
         //turn off unroll & space
         CarUnroll.SetActive(false);
         CompUnroll.SetActive(false);
         KitchUnroll.SetActive(false);
         OvShpUnroll.SetActive(false);
         //turn on scroll layer visibility
         ScrollPlane.SetActive(true);
     }
     if (Input.GetKeyDown(KeyCode.D))
     {
         //turn off unroll & scroll//
         CarUnroll.SetActive(false);
         CompUnroll.SetActive(false);
         KitchUnroll.SetActive(false);
         OvShpUnroll.SetActive(false);
         ScrollPlane.SetActive(false);
         //turn space layer visibility on//
         //turn on space animations//
     }


     //Phone raycast control//
     /*if (Input.touchCount > 0 && Input.touches[0].phase == TouchPhase.Began)
     {
     Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
         RaycastHit hit;
         if (Physics.Raycast(ray, out hit)){
             btnName = hit.transform.name;
             switch (btnName)
             {
                 case "myButton1":
                     if (switch.btnName == myButton1);
                     {

                     }
                     //turn off scroll & space//
                     //turn on unroll layer visibility//
                     CompUnroll.SetActive(true);
                     CarUnroll.SetActive(true);
                     KitchUnroll.SetActive(true);
                     OvShpUnroll.SetActive(true);
                     //turn on video players//
                     break;
                 case "myButton2":
                     //turn off unroll & space//
                     CompUnroll.SetActive(false);
                     CarUnroll.SetActive(false);
                     KitchUnroll.SetActive(false);
                     OvShpUnroll.SetActive(false);
                     //turn on scroll layer visibility//

                     //turn on video players or animation//
                     break;
                 case "myButton3":
                     //turn off unroll & scroll//
                     CompUnroll.SetActive(false);
                     CarUnroll.SetActive(false);
                     KitchUnroll.SetActive(false);
                     OvShpUnroll.SetActive(false);
                     //turn space layer visibility on//
                     //turn on space animations//
                     break;
                 default:
                     break;
             }
         }

     }*/
 }

}

I'm pretty new to coding, so any other tips would be great! I haven't updated