cs1002 error how do i fix?

Unity Engine
2

CS1002 is a missing semicolon.
Please use code tags when showing code as its very hard to read otherwise Using code tags properly

You have a few problems with your script.
They are easy to spot if you put them into a code editor such as Visual Studio
The red lines indicate potential problems. Mouse over them for more details.
6921182--811946--upload_2021-3-10_16-41-56.png

Code is case sensitive so you need to make sure to capitalize the classes, for example rigibody2D should be Rigidbody2D.

getcomponent should be GetComponent

You are also missing 2 semicolons,
1 after each line here
width = boxcollider.size.x
rb.velocity = new vector2(speed, 0)

This should be the end result

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

    public class backgroundscroller : MonoBehaviour
    {
        private BoxCollider2D boxcollider;
        private Rigidbody2D rb;
        private float width;
        private float speed = -3f;
        // use this for initialization
        void Start()
        {
            boxcollider = GetComponent<BoxCollider2D>();
            rb = GetComponent<Rigidbody2D>();
            width = boxcollider.size.x;
            rb.velocity = new Vector2(speed, 0);
        }
        // Update is called once per frame
        void Update()
        {
            if (transform.position.x < -width)
            {
                reposition();
            }
        }
        private void reposition()
        {
            Vector2 vector = new Vector2(width * 2f, 0);
            transform.position = (Vector2)transform.position + vector;
        }
    }
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