ObjectReference Not set to an instance of an object

Question

I'm trying to build a 'monthly event' system for my management game and it keep on throwing up the Object reference not set to an instance of an object issue on line 19, but only when the event occurs. The events are called from another script, and yes, I know it's a hideous mess but I haven't worked out how to optimise it yet. So, any help or guidance would be very much appreciated?

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 using System.Collections.Generic;
 using System;
 
 public class EventManager : MonoBehaviour {
     GameObject PopupWindow;
     Text PopupText;
     int RndEvent;
     int populationlvl;
     int nextintake;
 
     public static void EventOccurer(){    
         GameObject PopupWindow = GameObject.FindGameObjectWithTag("PopupWindow");
         int RndEvent;
         int populationlvl;
         int nextintake;
         Text PopupText = GameObject.Find("EventMessageText").GetComponent<UnityEngine.UI.Text> ();
 
         PopupWindow.SetActive (true);
         RndEvent = UnityEngine.Random.Range (1, 13);
         switch (RndEvent) 
         {
         case 1:
             PopupText.text = "Launch Failure! Loss of next intake!";
             populationlvl = WorldManager.PopulationLvl;
             nextintake = WorldManager.PopIntake;
             populationlvl -= nextintake;
             WorldManager.PopulationLvl = populationlvl;
             break;
         case 2:
             PopupText.text = "Landing Failure! Loss of next intake!";
             populationlvl = WorldManager.PopulationLvl;
             nextintake = WorldManager.PopIntake;
             populationlvl -= nextintake;
             WorldManager.PopulationLvl = populationlvl;
             break;
         case 3:
             break;
           //.....A whole lot of currently empty case statements...
         case 12:
             break;
         }
     }
 }

Answer 1

Do yourself a favor and break the chaining down a little and output some debugging messages, either the gameobject is not found or the component on the gameobject is not found, either way your assumptions either of the game of the gameobject(it may have a 1 next to the name if instantiating) or the component location is the hierarchy is incorrect and you need to adjust. I would replace line 19 with something like, you also have an issue that you have a field named the same as a local variable called PopupText, choose if you're going to hold this reference or not, pick one. I've changed the names below, but the debugging is what you need to isolate your issue.

 GameObject emt = GameObject.Find("EventMessageText"); // get the GO named EventMessageText
 Text emtText = null;
 
 if (emt == null) // check for null or that there is an instance found of this object
 {
   Debug.Log("EventMessageText gameobject was not found by the name EventMessageText"); // write out to console that the EventMessageText GameObject reference wasn't found, naming issue?
 }
 else // if emt is not null then lets try and get the Text component from it
 {
   emtText = emt.GetComponent<Text>();
 
   if (emtText == null)
     Debug.Log("Could not find Text Component of EventMessageText, emtText is null");
 }

ObjectReference Not set to an instance of an object

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