Resolved trying to make my turret target the closest enemy and then rotate to face it results in error

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Turret : MonoBehaviour
6. {
7.     public Transform target;
8.     public float speed = 1.0f;
9.     void OnTriggerStay(Collider col)
10.     {
11.         target = FindClosestEnemy();
12.         Vector3 targetDirection = target.position - transform.position;
13.         float singleStep = speed * Time.deltaTime;
14.         Vector3 newDirection = Vector3.RotateTowards(transform.forward, targetDirection, singleStep, 0.0f);
15.         Debug.DrawRay(transform.position, newDirection, Color.red);
16.         transform.rotation = Quaternion.LookRotation(newDirection);
17.     }
18.     public GameObject FindClosestEnemy()
19.     {
20.         GameObject[] gos;
21.         gos = GameObject.FindGameObjectsWithTag("Human");
22.         GameObject closest;
23.         closest = null;
24.         float distance = Mathf.Infinity;
25.         Vector3 position = transform.position;
26.         foreach (GameObject go in gos)
27.         {
28.             Vector3 diff = go.transform.position - position;
29.             float curDistance = diff.sqrMagnitude;
30.             if (curDistance < distance)
31.             {
32.                 closest = go;
33.                 distance = curDistance;
34.             }
35.         }
36.         return closest;
37.     }
38. }

Turret.cs(11,18) Cannot implicitly convert type 'UnityEngine.GameObject' to 'UnityEngine.Transform'
I do not understand what is wrong or how to fix this and google isnt turning up any results
theres no actual weapon for the turret yet. I am just trying to do this in smaller bite sized steps as I am not proficient in c#. This current script is trying to search for the closest player/NPC, and then it will rotate the weapon (a dish thats supposed to represent a parabolic mirror) to aim at its target

 

my brain didnt catch this and I realized what was wrong
fixed it by changing target = FindClosestEnemy(); to target = FindClosestEnemy().transform; and it worked perfectly