Having troubles with the checkpoints opening on my 2D platformer and its making my sprite dissapear.

I have set up a checkpoint and the sprite of the flag starts of closed but when the character walks through the checkpoint and touches the circle collider the character disappears and when I click on the scene the character is nowhere to be found. Here are some screenshots of what is happening and my code. This is the script for the player:using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour
{

public float moveSpeed;
private Rigidbody2D myRigidbody;

public float JumpSpeed;

public Transform groundCheck;
public float groundCheckRadius;
public LayerMask whatIsGround;

public bool isGrounded;

private Animator myAnim;

// Use this for initialization
void Start()
{
    myRigidbody = GetComponent<Rigidbody2D>();
    myAnim = GetComponent<Animator>();
}

// Update is called once per frame
void Update()
{

    isGrounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius, whatIsGround);

    if (Input.GetAxisRaw("Horizontal") > 0f)
    {
        myRigidbody.velocity = new Vector3(moveSpeed, myRigidbody.velocity.y, 0f);
        transform.localScale = new Vector3(0.4f, 0.4f, 0.3f);
    }
    else if (Input.GetAxisRaw("Horizontal") < 0f)
    {
        myRigidbody.velocity = new Vector3(-moveSpeed, myRigidbody.velocity.y, 0f);
        transform.localScale = new Vector3(-0.4f, 0.4f, -0.3f);

    }
    else
    {
        myRigidbody.velocity = new Vector3(0, myRigidbody.velocity.y, 0f);

    }

    if (Input.GetButtonDown("Jump") && isGrounded)
    {
        myRigidbody.velocity = new Vector3(myRigidbody.velocity.x, JumpSpeed, 0f);
    }

    
    myAnim.SetFloat("Speed", Mathf.Abs( myRigidbody.velocity.x));
    myAnim.SetBool("Grounded", isGrounded);
}

  void OnTriggerEnter2D(Collider2D other)
{
    if (other.tag == "KillPlane");
    {
        gameObject.SetActive(false);
    }
} 

}

here is the script for the checkpoint: using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CheckpointController : MonoBehaviour {

public Sprite flagClosed;
public Sprite flagOpen;

private SpriteRenderer theSpriteRenderer;

public bool CheckpointActive;

// Use this for initialization
void Start () {

    theSpriteRenderer = GetComponent<SpriteRenderer>();

}

// Update is called once per frame
void Update () {
	
}

private void OnTriggerEnter2D(Collider2D other)
{
    if (other.tag == "Player")
    {
        theSpriteRenderer.sprite = flagOpen;
        CheckpointActive = true;
    }
}

}


alt text

hi;
i read your code and saw your screen shots i think i cant find any problem in these;

so the problem must be else where ?
if u have “any desk” programm installed i can take a look at your system ;