我在我的Unity游戏引擎中穿过地面。有人知道我为什么穿过地面吗？我正在遵循教程：https://www.youtube.com/watch?v=LEUhxe9vUOM&list=PLrnPJCHvNZuCVTz6lvhR81nnaf1a-b67U&index=6&ab_channel=CodinginFlow。
下面是我的PlayerMovement代码（我将其命名为PlayerMovementProject4.cs）：

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

public class PlayerMovementProject4 : MonoBehaviour
{
    private Rigidbody2D rb; //Will store appropriate Rigidbody2D from PlayerMovement
    private Animator anim;
    [SerializeField] private LayerMask jumpableGround;
    private float dirX = 0f;
    private SpriteRenderer sr;
    private BoxCollider2D coll;
    [SerializeField] private float moveSpeed = 7f;
    [SerializeField] private float jumpForce = 14f;

    private enum MovementState { idle, running, jumping, falling}
    

    // Start is called before the first frame update
    private void Start()
    {
        rb = GetComponent<Rigidbody2D>();
        coll = GetComponent<BoxCollider2D>();
        sr = GetComponent<SpriteRenderer>();
        anim = GetComponent<Animator>();
    }

    // Update is called once per frame
    private void Update()
    {
        dirX = Input.GetAxis("Horizontal"); //Might be appropriate to change to GetAxisRaw
        rb.velocity = new Vector2(dirX * 7f, rb.velocity.y);

        if (Input.GetButtonDown("Jump") && IsGrounded())
        {
            rb.velocity = new Vector2(rb.velocity.x, jumpForce);
        }
        UpdateAnimationUpdate();
        
    }

    private void UpdateAnimationUpdate() //Will be used to handle Animations
    {
        MovementState myMovementState;
        
        if (dirX > 0f)
        {
            myMovementState = MovementState.running;
            sr.flipX = false;
        }
        else if (dirX < 0f)
        {
            myMovementState = MovementState.running;
            sr.flipX = true;
        }
        else //Exactly 0
        {
            myMovementState = MovementState.idle;
        }

        if (rb.velocity.y > 0.1f)
        {
            myMovementState = MovementState.jumping;
        }
        else if (rb.velocity.y < -0.1f)
        {
            myMovementState = MovementState.falling;
        }
        anim.SetInteger("state", (int)(myMovementState));
    }
    private void UpdateAnimationUpdate(float ff) //Might need to use this
    {
        dirX = ff;
        UpdateAnimationUpdate(); //DO NOT REPEAT CODE (DRY)
    }

    private bool IsGrounded()
    {
        return Physics2D.BoxCast(coll.bounds.center, coll.bounds.size, 0f, Vector2.down, .1f, jumpableGround);
        
    }
}

另外，这里是我得到的错误的屏幕截图：

如果有人能帮助我，我将不胜感激。
谢谢你！