what is wrong with code there, the line: rb.velocity = Rigidbody. velocity.normilized: shows an error?

using System.Collections; using System.Collections.Generic; using UnityEngine; //This is used for Unity 5, Here you will create a c# code that will check the current y value on the rigid body. //If the y-value is higher than the existing, overwrite it. (That way you will only store the maximum y-value). public class Speed : MonoBehaviour { public Rigidbody rb; public float y = 100f; // Use this for initialization void Start() { rb = GetComponent(); } // Update is called once per frame void FixedUpdate() { if (rb.velocity.magnitude > y) { rb.velocity = Rigidbody.velocity.normalized; } } }