Что значат эти ошибки (Unity3d, C#)?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class BulletControl : MonoBehaviour, IEndDragHandler, IDragHandler, IBeginDragHandler
{

    public void OnDrag(PointerEventData eventData)
    {
        transform.position.y = eventData.pointerCurrentRaycast.screenPosition;
    }
    
    Vector3 moveVec;

    public float speed = 5;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void FixedUpdate()
    {
        transform.Translate(Vector3.left * Time.deltaTime * speed);
    }
}