Loot System that load items from resource folder to array

Hello everyone.

I'm fiddling with a loot system kinda like Dayz, but dumbed down. In short, I have an empty gameobject called "SpawnFood" as a prefab and I want to be able to just place it around my map and make it spawn a random item from an array. I want it to spawn an item when the player gets within a certain distance and only if there is not an item there already. Also I'm trying to make it despawn the item after a certain time if the player does not pick it up.

This is what I got so far:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class LootManager : MonoBehaviour
 {
 
     public GameObject[] foodItem;
     public Transform spawnPoint;
     public bool isSpawnable = true;
     private GameObject player;
 
     public float distance;
     public float respawnTimer = 1.0f;
     public float despawnTimer = 1.0f;
 
 
     private void Start()
     {
         player = GameObject.FindGameObjectWithTag("Player");
         foodItem = Resources.LoadAll("Fooditems") as GameObject[];
     }
 
     void Update()
     {
         int foodItem_num = Random.Range(0, foodItem.Length);
         distance = Vector3.Distance(transform.position, player.transform.position);
         
         if (distance <= 5.0f && isSpawnable == true && respawnTimer <= 0)
         { 
             Instantiate(foodItem[foodItem_num], spawnPoint.position, spawnPoint.rotation);
             foodItem[foodItem_num].transform.SetParent(spawnPoint);
             Debug.Log("Spawning Item");
             isSpawnable = false;
         }
         else
         {
             return;
         }
 
         if (isSpawnable == false)
         {
             despawnTimer -= Time.time;
             if (despawnTimer <= 0.0f)
             {
                 if (transform.childCount > 0)
                 {
                     Transform child = transform.GetChild(0);
                     child.parent = null;
                     Destroy(child.gameObject);
                 }
             }
         }
     }
 }
 

I get 2 errors with this code. An "Array Index is out of range", which points me to this line:

             foodItem[foodItem_num].transform.SetParent(spawnPoint);

and an "Object reference not set to an instance of an object", which points me to this;

             Instantiate(foodItem[foodItem_num], spawnPoint.position, spawnPoint.rotation);

Can anyone tell me what I'm doing wrong? When I press play, the items that I've put in the fooditem array in the inspector disappears and its size is set to 0.