Binary Formatting Loading Error

I have a script which is intended to save / load the whole game. When unity compiles the script no errors. When I save the game no error, however when I load the game I get this error

"ArgumentException: Object type NewItem[] cannot be converted to target type: System.Int32[] Parameter name: val System.Reflection.MonoField.SetValue (System.Object obj, System.Object val, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoField.cs:148) System.Reflection.FieldInfo.SetValue (System.Object obj, System.Object value) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/FieldInfo.cs:150) System.Runtime.Serialization.ObjectRecord.SetMemberValue (System.Runtime.Serialization.ObjectManager manager, System.Reflection.MemberInfo member, System.Object value) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:439) System.Runtime.Serialization.FixupRecord.FixupImpl (System.Runtime.Serialization.ObjectManager manager) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:396) System.Runtime.Serialization.BaseFixupRecord.DoFixup (System.Runtime.Serialization.ObjectManager manager, Boolean strict) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:329) System.Runtime.Serialization.ObjectRecord.DoFixups (Boolean asContainer, System.Runtime.Serialization.ObjectManager manager, Boolean strict) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:506) System.Runtime.Serialization.ObjectManager.RegisterObjectInternal (System.Object obj, System.Runtime.Serialization.ObjectRecord record) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:255) System.Runtime.Serialization.ObjectManager.RegisterObject (System.Object obj, Int64 objectID, System.Runtime.Serialization.SerializationInfo info, Int64 idOfContainingObj, System.Reflection.MemberInfo member, System.Int32[] arrayIndex) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization/ObjectManager.cs:306) System.Runtime.Serialization.Formatters.Binary.ObjectReader.RegisterObject (Int64 objectId, System.Object objectInstance, System.Runtime.Serialization.SerializationInfo info, Int64 parentObjectId, System.Reflection.MemberInfo parentObjectMemeber, System.Int32[] indices) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/ObjectReader.cs:314) System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadNextObject (System.IO.BinaryReader reader) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/ObjectReader.cs:157) System.Runtime.Serialization.Formatters.Binary.ObjectReader.ReadObjectGraph (BinaryElement elem, System.IO.BinaryReader reader, Boolean readHeaders, System.Object& result, System.Runtime.Remoting.Messaging.Header[]& headers) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/ObjectReader.cs:110) System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.NoCheckDeserialize (System.IO.Stream serializationStream, System.Runtime.Remoting.Messaging.HeaderHandler handler) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/BinaryFormatter.cs:179) System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize (System.IO.Stream serializationStream) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Runtime.Serialization.Formatters.Binary/BinaryFormatter.cs:136) SLD.LoadPlayer (Int32 saveSlot) (at Assets/Resources/Scripts/SLD.cs:24) SLD.LoadAll (Int32 saveSlot) (at Assets/Resources/Scripts/SLD.cs:45) LoadScreen.BeginLoad () (at Assets/Resources/Scripts/LoadScreen.cs:39) "

This is the save/load script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System;
 using System.Runtime.Serialization.Formatters.Binary;
 using System.IO;
 
 public static class SLD {
 
     public static void SavePlayer (Player player, Inventory inv, PerkManager pm, int saveSlot = 0) {
         BinaryFormatter bf = new BinaryFormatter ();
         FileStream stream = new FileStream (Application.persistentDataPath + "/player" + saveSlot.ToString () + ".etc", FileMode.Create);
 
         PlayerData data = new PlayerData (player, inv, pm);
         bf.Serialize (stream, data);
         stream.Close ();
     }
 
     public static PlayerData LoadPlayer (int saveSlot = 0) {
         if (File.Exists (Application.persistentDataPath + "/player.etc")) {
             BinaryFormatter bf = new BinaryFormatter ();
             FileStream stream = new FileStream (Application.persistentDataPath + "/player" + saveSlot.ToString () + ".etc", FileMode.Open);
 
             PlayerData data = bf.Deserialize (stream) as PlayerData;
 
             stream.Close ();
 
             foreach (Spawner spawn in Player.p.spawners) {
                 spawn.Save (saveSlot);
             }
 
             foreach (Container spawn in Player.p.containers) {
                 spawn.Save (saveSlot);
             }
 
             return data;
         } else {
             Debug.LogError ("File does not exsit");
             return Player.p.pd;
         }
 
     }
 
     public static void LoadAll (int saveSlot = 0) {
         PlayerData data = LoadPlayer (saveSlot);
         Player.p.water = data.stats [0];
         Player.p.hunger = data.stats [1];
         Player.p.sleep = data.stats [2];
         Player.p.hp = data.stats [3];
 
         Player.p.exp = data.exp;
         Player.p.level = data.level;
 
         Transform player = Player.p.player;
         player.position = new Vector3 (data.x, data.y, data.z);
 
         PerkManager.p.unlocked = data.perkUnlocked;
         PerkManager.p.unlockTokens = data.perkTokens;
 
         int i = 0;
         while (i < Inventory.inv.slots.Length) {
             Inventory.inv.SetItem (i, data.slot [i]);
         //    Inventory.inv.slots [i].item = Inventory.inv.items[data.slot[i]];
             Inventory.inv.slots [i].amount = data.slotAmounts[i];
             i += 1;
         }
 
         NewNote.n.NewNot ("Load", "Load Complete");
         Debug.Log ("Loading Complete");
     }
 }
 
 [Serializable]
 public class PlayerData {
     public float[] stats = new float[4];
 
     public int exp = 0;
     public int level = 0;
 
     public float x = 0;
     public float y = 0;
     public float z = 0;
 
     public bool[] perkUnlocked = new bool[2];
     public int perkTokens;
 
     public int[] slot = new int[20];
     public int[] slotAmounts = new int[20];
 
     public PlayerData(Player player, Inventory inv, PerkManager pm) {
         stats = new float[4];
         stats [0] = player.water;
         stats [1] = player.hunger;
         stats [2] = player.sleep;
         stats [3] = player.hp;
 
         exp = player.exp;
         level = player.level;
 
         x = player.player.position.x;
         y = player.player.position.y;
         z = player.player.position.z;
 
         perkUnlocked = pm.unlocked;
         perkTokens = pm.unlockTokens;
 
         int i = 0;
         while (i < inv.slots.Length) {
             slot [i] = inv.slots [i].item.id;
             slotAmounts [i] = inv.slots [i].amount;
             Debug.Log (inv.slots [i].slotId.ToString () + "---" + inv.slots [i].amount.ToString () + "---" + i.ToString ());
             i += 1;
         }
 
         NewNote.n.NewNot ("Save", "Save Complete");
         Debug.Log ("Saving Complete");
     }
 }

And this is the script in the array it's referencing in the error

 using UnityEngine;
 
 [CreateAssetMenu(fileName = "New Item", menuName = "Items")]
 public class NewItem : ScriptableObject {
     new public string name = "New Item";
     public float weight;
     public float pickUpDistance;
     public int id;
     public bool holdable;
     public GameObject heldObject;
     public Sprite texture;
     public GameObject itemPrefab;
     //public NewGun gunType;
     public bool isGun;
     public int value = 10;
 }