Array not working properly

I'm trying to make a screen at the end of each level that displays the time it took to complete it and the record time it took to complete it. I created 2 scripts to make this work. Everything works perfectly when I use a single float to define the record time but when I change it to an array, I get 2 errors. I need it to be an array because I want the script to work with multiple levels so I need to store multiple records.

Unexpected node type. UnityEngine.JsonUtility:FromJson(String) End_Level:LoadRecordTime() (at Assets/Scripts/End_Level.cs:123) End_Level:OnTriggerEnter2D(Collider2D) (at Assets/Scripts/End_Level.cs:43)

IndexOutOfRangeException: Array index is out of range. End_Level.LoadRecordTime () (at Assets/Scripts/End_Level.cs:124) End_Level.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/Scripts/End_Level.cs:43)

Please help. Been trying to fix this for an hour but I can't find a way. I set int loadedLevel to 0 in the inspector.

Script 1:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEngine.UI;

using System.IO;

public class End_Level : MonoBehaviour {

 GameObject player;
 public GameObject NewRecordText;
 GameObject[] UI;
 public GameObject EndScreen;

 public Text LevelTime;
 public Text RecordTime;
 
 float time;
 float bestTime;

 LeaderboardInfo leaderboardInfo;
 public int loadedLevel;

 void Start () {

     player = GameObject.FindGameObjectWithTag("Player");
     leaderboardInfo = new LeaderboardInfo();
     
 }
 
 
 private void OnTriggerEnter2D(Collider2D other)
 {
     if (other.tag == "Player")
     {
         Time.timeScale = 0;
         player.SetActive(false);
         UI = GameObject.FindGameObjectsWithTag("UI");
         for (int i = 0; i < UI.Length; i++)
         {
             UI[i].SetActive(false);
         }
         time = Timer.t;
         LoadRecordTime();
         SetTime();
         SetRecordTime();


         EndScreen.SetActive(true);         
     }                     
 }
    
 public void SetTime()
 {           
         string minutes = ((int)time / 60).ToString();
         string seconds = (time % 60).ToString("f2");
         if (minutes.Equals("0"))
         {
             LevelTime.text = "Temps: " + seconds;
         }
         else
         {
             if (seconds.Length == 4)
             {
                 LevelTime.text = "Temps: " + minutes + ":0" + seconds;
             }
             else
             {
                 LevelTime.text = "Temps: " + minutes + ":" + seconds;
             }
         }
 }

 public void SetRecordTime()
 {
     if(time < bestTime)
     {
         string minutes = ((int)time / 60).ToString();
         string seconds = (time % 60).ToString("f2");
         if (minutes.Equals("0"))
         {
             RecordTime.text = "Record: " + seconds;
         }
         else
         {
             if (seconds.Length == 4)
             {
                 RecordTime.text = "Record: " + minutes + ":0" + seconds;
             }
             else
             {
                 RecordTime.text = "Record: " + minutes + ":" + seconds;
             }
         }
         SaveRecordTime();
         NewRecordText.SetActive(true);
     }
     else
     {
         string minutes = ((int)bestTime / 60).ToString();
         string seconds = (bestTime % 60).ToString("f2");
         if (minutes.Equals("0"))
         {
             RecordTime.text = "Record: " + seconds;
         }
         else
         {
             if (seconds.Length == 4)
             {
                 RecordTime.text = "Record: " + minutes + ":0" + seconds;
             }
             else
             {
                 RecordTime.text = "Record: " + minutes + ":" + seconds;
             }
         }
         NewRecordText.SetActive(false);
     }
 }
 public void LoadRecordTime()
 {
     if (System.IO.File.Exists(Application.persistentDataPath + "/leaderboardinfo.json"))
     {
         leaderboardInfo = JsonUtility.FromJson<LeaderboardInfo>(File.ReadAllText(Application.persistentDataPath + "/leaderboardinfo.json"));
         bestTime = leaderboardInfo.TimeLevel[loadedLevel];
     }
     else
     {
         bestTime = Mathf.Infinity;
     }
 }
 public void SaveRecordTime()
 {
     leaderboardInfo.TimeLevel[loadedLevel] = time;
     if (loadedLevel > leaderboardInfo.LevelsFinished)
     {
         leaderboardInfo.LevelsFinished = loadedLevel;
     }

     string jsonData = JsonUtility.ToJson(leaderboardInfo, false);
     File.WriteAllText(Application.persistentDataPath + "/leaderboardinfo.json", jsonData);
 }

}

Scrpit 2:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class LeaderboardInfo

{

 public int LevelsFinished;

 public float[] TimeLevel = new float[1];

}

THANKS FOR YOUR HELP