sửa lỗi unity using System.Collections; using System.Collections.Generic; using UnityEngine; public class BridController : MonoBehaviour { public float bounceForce; private Rigidboody2D myBody; private Animator anim; // Start is called before the first frame update void Awake () { myBody = GetComponent<Rigidboody2D> (); anim = GetComponent<Animator> (); } // Update is called once per frame void FixedUpdate() { BirdMoveMent (); } void BirdMoveMent() { if (Input.GetMouseButtonDown (0)) { myBody.velocity = new Vector2 (myBody.velocity.x, bounceForce); } } } nó hiện lỗi là :>>> Assets\Scripts\BirdController\BridController.cs(9,13): error CS0246: The type or namespace name 'Rigidboody2D' could not be found (are you missing a using directive or an assembly reference?)