How to correct the mistake CS1001?

Unity Engine
,
1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class Helper : MonoBehaviour
{
    NavMeshAgent navMeshAgent;
    Zombie zombie;
    Helper helper;
    CapsuleCollider capsuleCollider;
    Animator animator;
    MovementAnimator movementAnimator;

    // Start is called before the first frame update
    void Start()
    {
        speed = animator.SetFloat("speed", navMeshAgent.velocity.magnitude).float;
        navMeshAgent = GetComponent<NavMeshAgent>();
        zombie = FindObjectOfType<Zombie>();
        navMeshAgent.updateRotation = false;
        capsuleCollider = GetComponent<CapsuleCollider>();
        animator = GetComponentInChildren<Animator>();
        movementAnimator = GetComponent<MovementAnimator>();
    }

    // Update is called once per frame
    void Update()
    {
        if (speed == 0) {
            zombie = FindObjectOfType<Zombie>();
        }
        navMeshAgent.SetDestination(zombie.transform.position);
        transform.rotation = Quaternion.LookRotation(navMeshAgent.velocity.normalized);
    }
}

CS1001: Identifier expected (20,77)
CS1002: ; expected (20,77)
CS1001: Identifier expected (20,80)

2

Line 18:
speed = animator.SetFloat("speed", navMeshAgent.velocity.magnitude).float;

Remove the extra “.float” part at the end, that is invalid syntax:
speed = animator.SetFloat("speed", navMeshAgent.velocity.magnitude);

3

Oh, thank you so much!