Unity RigidBody2D Eroor

Question

I wrote a simple behaviour script for the player object but when I started using RigidBody2D in the code Unity doesn't understand it...

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

public class PlayerBehaviour : MonoBehaviour
{

    RigidBody2D rb;
    int speedX;
    
    void Start()
    {
        rb = GetComponent<RigidBody2D>();
        speedX = -1f;
        rb.velocity = new Vector2(1f, 0f);
    }
}

Here's the error (in Unity because VSCODE and Rider don't show it): Error in Unity

I tried to make the code simpler and simpler and add the script to the Player sprite one more time, I expected that at some point the problem will disappear but it didn't...

Answer 1

it's Rigidbody2D not RigidBody2D the b is lowercase