Referencing a script from another script does not work,Referencing functions from another Script isnt working

Questions & Answers
1

I am getting more and more frustrated and just can’t get to the bottom of this problem I have.I want to call a function from another Script in my “Player”-Script but Unity keeps throwing this error: NullReferenceException: Object reference not set to an instance of an object
Player.Start () (at Assets/Scripts/Player.cs:22)
I have looked up multiple solutions but none of them seem to work. What is confusing me, is the fact that the functions and the class itself in the “PowerBar”-Script show that they are being referenced in the “Player”-Script. I don’t get why Unity tells me that they are not referenced to.

This is the Player-Script: (PlayerMovement is the CharacterController-Script, which works perfectly fine)

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

public class Player : MonoBehaviour
{
    public PlayerMovement playerMovement;
    float horMove = 0f;
    bool jump = false;
    bool crouch = false;
	public float runSpeed = 40f;

    public PowerBar powerBar;
    public int minPower = 10;
    public int currentPower;


    // Start is called before the first frame update
    void Start()
    {
        currentPower = minPower;
        powerBar.SetMinPower(minPower);
    }

    // Update is called once per frame
    void Update()
    {
        PlayerInput();
        GainPower(10);
    }

    void FixedUpdate()
    {
		// Move Character
        playerMovement.Move(horMove * Time.fixedDeltaTime, crouch, jump);
		jump = false;
    }

    void PlayerInput()
	{
		horMove = Input.GetAxisRaw("Horizontal") * runSpeed;

        if(Input.GetButtonDown("Jump"))
        {
            jump = true;
       	}

        if(Input.GetButtonDown("Crouch"))
        {
       		 crouch = true;
        } else if(Input.GetButtonUp("Crouch"))
       	{
        	  crouch = false;
       	}
	}

    void GainPower(int gain)
    {
        if(Input.GetKeyDown(KeyCode.Y)) 
        {
            currentPower += gain;
            powerBar.SetPower(currentPower);
        }
    }
}

This is the PowerBar Script:

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

public class PowerBar : MonoBehaviour
{
    public Slider slider;
    public Gradient gradient;
    public Image fill;

    public void SetMinPower(int power)
    {
        slider.minValue = power;
        slider.value = power;

        fill.color = gradient.Evaluate(1f);
    }
    public void SetPower(int power)
    {
        slider.value = power;

        fill.color = gradient.Evaluate(slider.normalizedValue);
    }
}

I hope someone can help me because I spent way too much time on this simple problem. Both of the Scripts are stored in the same folder by the way, so that can’t be the problem.

2

You aren’t initialising powerBar anywhere before the Start method is run. So it’s null. Which is why you are getting a null reference exception.