Unity 5 Calling Function From Another Script On A Different Object

Questions & Answers
1

So I’m trying to get a function to run from a parent script when I click on an object with a particular tag.
Script A (RayCastHit) is for my raycast and tests if it has hit the particular object while Script B(PickUpReactions) is for reducing a count.
Script B is attached to the parent object while Script A is attached to the child.

using UnityEngine;
using System.Collections;

public class RayCastHit : MonoBehaviour
{

public int PowerAmount = 1;
public float fireRate = 0.25f;
public float weaponRange = 50f;
public Camera MainCam;
public AudioClip ShotsFired;
private float nextFire;

void Start()
{
    MainCam = GetComponentInParent<Camera>();
}

void Update()
{
    if (Input.GetButtonDown("Fire1") && Time.time > nextFire)
    {
        nextFire = Time.time + fireRate;
        Vector3 rayOrigin = MainCam.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0.0f));
        RaycastHit hit;
    if (Physics.Raycast(rayOrigin, MainCam.transform.forward, out hit, weaponRange))
        {
            if (hit.transform.gameObject.tag == "Generator")
            {
                gameObject.GetComponent<PickUpReactions>().ReduceCount();
                AudioSource.PlayClipAtPoint(ShotsFired, transform.position);
            }
        }
    }
}

}

but because of the “gameObject.GetComponent().ReduceCount();” line, it comes up with the error “NullReferenceException: Object reference not set to an instance of an object
RayCastHit.Update () (at Assets/Scripts/RayCastHit.cs:41)”. he other script looks like this.

using UnityEngine;
using System;
using UnityEngine.UI;
using System.Collections;

public class PickUpReactions : MonoBehaviour {
public int count;

void Start () {
    count = 0;
}

public void ReduceCount()
{
    if (count >= 0)
    {
        count = count - 1;
    }
}

}
I’ve spent hours googling solutions that don’t work yet so I don’t know why they don’t want to talk.

2

You are trying to find ReduceCount script on the same game object that has RayCastHit script.

Shouldn’t this line:
gameObject.GetComponent().ReduceCount();

be instead:
transform.parent.gameObject.GetComponent().ReduceCount();