Simple 2D grappling gun code for unity engine

GrapplingGun.cs

//FROM PROJECT ROROPE || REAL GAMES STUDIO
//************************************************
//realgamesss.weebly.com
//gamejolt.com/@Real_Game
//realgamesss.newgrounds.com/
//real-games.itch.io/
//youtube.com/channel/UC_Adg-mo-IPg6uLacuQCZCQ
//************************************************

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

public class GrapplingGun : MonoBehaviour
{
    DistanceJoint2D rope;

    bool checker;
    
    void Start()
    {
        gameObject.AddComponent<LineRenderer>();
        gameObject.AddComponent<RigidBody2D>();
    }
    
    void Update()
    {
        // Detect mouse position
        Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);

        // Shot rope on mouse position
        if (Input.GetMouseButtonDown(0) && checker == true)
        {
            rope = gameObject.AddComponent<DistanceJoint2D>();
            rope.connectedAnchor = mousePos;

            checker = false;
        }
        
        // Destroy rope
        else if (Input.GetMouseButtonDown(0))
        {
            DestroyImmediate(rope);

            checker = true;
        }
    }
}

Ok I know I'm a moron and this is probably the most obvious solution ever, but how do I get the script to recognize my player character as the rigidbody? I have the script attached to my player but it doesn't work and comes up with an error stating that "'rigidbody2d' could not be found."

Once again, I know I'm probably an idiot and the solution is super simple, but I suck ass at coding and this is my first real attempt at making a game for a class.

Ok I know I'm a moron and this is probably the most obvious solution ever, but how do I get the script to recognize my player character as the rigidbody? I have the script attached to my player but it doesn't work and comes up with an error stating that "'rigidbody2d' could not be found."

Once again, I know I'm probably an idiot and the solution is super simple, but I suck ass at coding and this is my first real attempt at making a game for a class.

You need to add RigidBody2D component to your player.