How to fix "fixedAngle is no longer supported" error?

Question

Unity

mistake:

CS0618:'Rigidbody2D.fixedAngle'is obsolete:"fixedAngle'is no longer supported. Use constrains instead'

.

There is an error in this code, despite the fact that it still worked today, please help

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Rigidbody2D))]

public class PlayerControll : MonoBehaviour {

  public enum ProjectAxis {onlyX = 0, xAndY = 1};
  public ProjectAxis projectAxis = ProjectAxis.onlyX;
  public float speed = 80;
  public float addForce = 70;
  public bool lookAtCursor;
  public KeyCode leftButton = KeyCode.A;
  public KeyCode rightButton = KeyCode.D;
  public KeyCode upButton = KeyCode.W;
  public KeyCode downButton = KeyCode.S;
  public KeyCode addForceButton = KeyCode.Space;
  public bool isFacingRight = true;
  private Vector3 direction;
  private float vertical;
  private float horizontal;
  private Rigidbody2D body;
  private float rotationY;
  private bool jump;

  void Start () 
  {
    body = GetComponent<Rigidbody2D>();
    body.fixedAngle = true;

    if(projectAxis == ProjectAxis.xAndY) 
    {
      body.gravityScale = 0;
      body.drag = 10;
    }
  }

  void OnCollisionStay2D(Collision2D coll) 
  {
    if(coll.transform.tag == "Ground")
    {
      body.drag = 10;
      jump = true;
    }
  }
  
  void OnCollisionExit2D(Collision2D coll) 
  {
    if(coll.transform.tag == "Ground")
    {
      body.drag = 0;
      jump = false;
    }
  }
  
  void FixedUpdate()
  {
    body.AddForce(direction * body.mass * speed);

    if(Mathf.Abs(body.velocity.x) > speed/100f)
    {
      body.velocity = new Vector2(Mathf.Sign(body.velocity.x) * speed/100f, body.velocity.y);
    }

    if(projectAxis == ProjectAxis.xAndY)
    {
      if(Mathf.Abs(body.velocity.y) > speed/100f)
      {
        body.velocity = new Vector2(body.velocity.x, Mathf.Sign(body.velocity.y) * speed/100f);
      }
    }
    else
    {
      if(Input.GetKey(addForceButton) && jump)
      {
        body.velocity = new Vector2(0, addForce);
      }
    }
  }

  void Flip()
  {
    if(projectAxis == ProjectAxis.onlyX)
    {
      isFacingRight = !isFacingRight;
      Vector3 theScale = transform.localScale;
      theScale.x *= -1;
      transform.localScale = theScale;
    }
  }
  
  void Update () 
  {
    if(lookAtCursor)
    {
      Vector3 lookPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.transform.position.z));
      lookPos = lookPos - transform.position;
      float angle  = Mathf.Atan2(lookPos.y, lookPos.x) * Mathf.Rad2Deg;
      transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
    }

    if(Input.GetKey(upButton)) vertical = 1;
    else if(Input.GetKey(downButton)) vertical = -1; else vertical = 0;

    if(Input.GetKey(leftButton)) horizontal = -1;
    else if(Input.GetKey(rightButton)) horizontal = 1; else horizontal = 0;

    if(projectAxis == ProjectAxis.onlyX) 
    {
      direction = new Vector2(horizontal, 0); 
    }
    else 
    {
      if(Input.GetKeyDown(addForceButton)) speed += addForce; else if(Input.GetKeyUp(addForceButton)) speed -= addForce;
      direction = new Vector2(horizontal, vertical);
    }

    if(horizontal > 0 && !isFacingRight) Flip(); else if(horizontal < 0 && isFacingRight) Flip();
  }
}

Answer 1

1. Not an error, but a warning
2. It is written: do not use fixedAngle, but use constraints
https://docs.unity3d.com/ScriptReference/Rigidbody...
Most likely, you need something like:

// Вместо body.fixedAngle = true;
// Следует использовать
body.constraints = RigidbodyConstraints.FreezeRotation;
// Либо
body.freezeRotation = true;