[FIXED.]I can't make the bool = false when I exit the collision (OntriggerExit2D)

This is the climbing tree code.

Help me please. Already set the animation bool climbingCheck = true when enter the collision but it does not false on exit the tree collision(2d). Sorry for my noob English too.

Where should I put climbingCheck = false; on the code part? .......................................

 void Update()
     {
 
         //use for space spcaebar 1 time to highest jump.
         //Input.GetAxis("Jump")>0  use for hold space bar to jump higher until max.
         if (grounded && Input.GetButtonDown("Jump"))
         {
             audiox.PlayOneShot(Jump, 0.3f);
             grounded = false;
 
             anim.SetBool("isGrounded", grounded);
             rigid2d.AddForce(new Vector2(0, jumpHeight));
         }
 
 
 
 
         if (canClimb)
         {
 
             //CLIMB UP
             if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.UpArrow))
             {
                 anim.SetBool("climbingCheck", climbingCheck);
                 //rigid2d.velocity = new Vector2(0, climbspeed);
                 climbingCheck = true;
                 climbing = true;
                 transform.Translate(Vector2.up * 0.5f * Time.deltaTime);
                 rigid2d.isKinematic = true;
                 rigid2d.velocity = new Vector2(0, 0);
 
                 //CLIMB Animation
                 anim.SetFloat("Direction", 1);
                 OnLadder = true;
 
                 anim.enabled = true;
                 maxSpeed = 0.7f;
                 if (!facingRight)
                 {
                     flip();
                     return;
                 }
                 canClimDown = true;
             }
             else if (Input.GetKeyUp(KeyCode.W) || Input.GetKeyUp(KeyCode.S) || Input.GetKeyUp(KeyCode.UpArrow) || Input.GetKeyUp(KeyCode.DownArrow))
             {
                 anim.enabled = false;
             }else
             {
                 climbingCheck = false;
             }
 
 
             if (canClimDown)
             {
                 //CLIMB DOWN
                 if (Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.DownArrow) && rigid2d.isKinematic == true)
                 {
                     climbing = true;
                     transform.Translate(Vector2.down * 0.5f * Time.deltaTime);
                     anim.SetFloat("Direction", -1);
                     anim.Play("Player_climbing", -1, float.NegativeInfinity);
                     OnLadder = true;
                     // rigid2d.velocity = new Vector2(0, -0.48f);
                     anim.enabled = true;
                 }
                 else if (Input.GetKeyUp(KeyCode.W) || Input.GetKeyUp(KeyCode.S) || Input.GetKeyUp(KeyCode.UpArrow) || Input.GetKeyUp(KeyCode.DownArrow))
                 {
                     anim.enabled = false;
                 }
             }else
             {
                 climbingCheck = false;
             }
 
         }
 
         if(canClimb == false)
         {
             rigid2d.isKinematic = false;
         }
 
 
     }
 
 
     void OnTriggerEnter2D(Collider2D other)
     {
         if (other.tag == "LadderStart")
         {
             canClimb = true;
         }
     }
 
     void OnTriggerExit2D(Collider2D other)
     {
         if (other.tag == "LadderStart")
         {
             canClimb = false;
             //rigid2d.isKinematic = false;
             anim.enabled = true;
             climbingCheck = false;
            
         }
     }