Игрок проваливается сквозь землю в юнити 2d

Что делать?
скрипт земли:

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

public class Ground : MonoBehaviour
{
private void OnCollisionEnter2D(Collision2D collision)
{
if (collision.gameObject.CompareTag("Player"))
{
Physics2D.IgnoreCollision(collision.collider, GetComponent<Collider2D>());
}
}
}



скрипт игрока:


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

public class PlayerController : MonoBehaviour
{
public float speed = 5f;
public float runSpeed = 10f;
public float jumpForce = 10f;
private bool isGrounded;
private Rigidbody2D rb;
private BoxCollider2D boxCollider;

void Start()
{
rb = GetComponent<Rigidbody2D>();
boxCollider = GetComponent<BoxCollider2D>();
}

void Update()
{
float horizontalInput = Input.GetAxis("Horizontal");

Vector2 movement = new Vector2(horizontalInput, rb.velocity.y);

if (Input.GetKey(KeyCode.LeftShift))
{
movement.x = runSpeed;
}
else
{
movement.x= speed;
}

if (Input.GetKeyDown( KeyCode.Space ) && isGrounded)
{
rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
}

rb.velocity = movement;
}

void FixedUpdate()
{
isGrounded = Physics2D.BoxCast( boxCollider.bounds.center , boxCollider.bounds.size, 0f, Vector2.down, 0.1f, LayerMask.GetMask("Ground"));
}
}