How Activating a boolean fron another script(C#)

I’ve tried using this script and I am getting the following error:Object reference not set to an instance of an object

using UnityEngine;
using System.Collections;

public class Seal_Triggerr : MonoBehaviour {

	// Use this for initialization
	void Start () {
	// Update is called once per frame
	void Update () {

	void OnTriggerEnter(Collider Other){
		GameObject.Find ("Seal Plate").GetComponent<Plate_Command>().start=true;

Object reference not set to an instance of an object must be the most asked question of all time here …

This tells you everything !

Didn’t find the object you are talking about.

What object? It’s hard to determine in your one-liner code. Well, its either the gameobject or the component.

Break It Down …

//GameObject.Find ("Seal Plate").GetComponent<Plate_Command>().start=true;

GameObject plateObject = GameObject.Find ("Seal Plate");

if ( !plateObject )
	Debug.LogError( "NO Seal Plate WAS FOUND ...." );

Plate_Command plateScript = plateObject.GetComponent<Plate_Command>();

if ( !plateScript )
	Debug.LogError( "NO Plate_Command WAS FOUND ...." );