Health Pickup System in Unity doesnt work and i will get an Error

July 27, 2022

I make a script that detects if a HealthPickup has been triggered. If this is the case, it should check whether a certain script is present. If this is the case too, a function within this script should be accessed. But I get this error in the console:

‘CharacterController’ does not contain a definition for ‘ChangeHealth’
and no accessible extension method ‘ChangeHealth’ accepting a first
argument of type ‘CharacterController’ could be found (are you missing
a using directive or an assembly reference?)

My codes:

CharacterController.cs

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

public class PlayerController : MonoBehaviour
{
Rigidbody2D rigidbody2d;
float horizontalmovement;
float verticalmovement;

//Playerstats Variabeln
int currentHealth;
int maxHealth = 5;

public float moveSpeed = 3.0f;

public void Start()
{
    rigidbody2d = GetComponent<Rigidbody2D>();
    currentHealth = 1;

}

public void Update()
{
    horizontalmovement = Input.GetAxis("Horizontal");
    verticalmovement = Input.GetAxis("Vertical");
}

private void FixedUpdate()
{
    Vector2 position = rigidbody2d.position;

    position.x = position.x + moveSpeed * horizontalmovement * Time.deltaTime;
    position.y = position.y + moveSpeed * verticalmovement * Time.deltaTime;

    rigidbody2d.MovePosition(position);
}

public void ChangeHealth(int amount)
{
    currentHealth = Mathf.Clamp(currentHealth + amount, 0, maxHealth);
    Debug.Log(currentHealth + "/" + maxHealth);
}
 }

GetHealth.cs

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

public class GetHealth : MonoBehaviour
{
    private void OnTriggerEnter2D(Collider2D other)
    {
        CharacterController controller = other.GetComponent<CharacterController>();

        if(controller != null)
        {
            controller.ChangeHealth(1);
            Destroy(gameObject);
        }
    }
}