what is wrong with this code?

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

public class UkkelinLiike : MonoBehaviour
{

    public float moveSpeed;

    public Rigidbody2D rb;

    private Vector2 moveDirection;
    
    // Update is called once per frame
    void Update()
    {
        ProcessInputs();
    }
    void FixedUpdate()
    {
        Move();
    }
    
    void ProcessInputs()
    {
        float moveX = Input().GetAxisRaw("Horizontal");
        float moveY = Input().GetAxisRaw("Vertical");

        moveDirection = new Vector2(moveX, moveY).normalized;
    }

    void Move()
    {
        rb.velocity = new Vector2(moveDirection.x * moveSpeed, moveDirection.y * moveSpeed);
    }
}