"There is no 'GameObject' attached to the "x" game object'

I’m trying to have a script change two objects in my game between enabled and disabled, and I have a script to get the component of both of these game objects, but every time I run my game, the game objects seem to disappear from the ‘GetComponent’ section of the script, thus giving me the error that ‘There is no ‘GameObject’ attacked to the “x” game object’. I don’t know why this keeps happened, or what to do to fix it, so I was hoping that someone could point me in the right direction?

This is my script that changes the stats of the game objects:

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

public class Door : MonoBehaviour
{
    public GameObject doorOpen;
    public GameObject doorClosed;
    public bool Collide;
    public bool doorShut;

    // Use this for initialization
    void Start()
    {
        doorOpen = GetComponent<GameObject>();
        doorClosed = GetComponent<GameObject>();
        doorShut = true;
        doorClosed.SetActive(true);
        doorOpen.SetActive(false);

    }

    // Update is called once per frame
    void Update()
    {
        
    }

    void OnGUI()
    {
        if (Collide == true)
        {
            if (doorShut)
            {
                GUI.Label(new Rect(Screen.width / 2 - 100, Screen.height / 2 + 10, 200, 100), "Press E to Open");
            }
        }
    }
    void OnTriggerEnter(Collider other)
    {

        if (other.tag == "Player")
        {
            Collide = true;
            if (Input.GetKeyDown(KeyCode.E))
            {
                doorClosed.SetActive(false);
                doorOpen.SetActive(true);
                doorShut = false;
            }
        }
    }

    void OnTriggerExit(Collider other)
    {
        if (other.tag == "Player")
        {
            Collide = false;
        }
    }
}

Here are pictures of the script before running and after running:

Not Running:
96382-nopt-playing.png

Running:
96383-playing.png

Thank you!

Try deleting the first two lines in your start… you already do this in inspector, so you shouldn’t need to look for any components.

A gameobject is not a component, so the syntax GetComponent<GameObject>() doesn’t make any sense. Components are attached to gameobjects. Since you already have a reference to the doorOpen and doorClosed gameobjects you should just call .SetActive directly on them.