Google Play Leaderboard help

I try to use leaderboards in my game but I cant use long. I see this error.

Assets/Scripts/HS2.cs(32,10): error CS1502: The best overloaded method match for `UnityEngine.Social.ReportScore(long, string, System.Action)' has some invalid arguments

How can I fix this

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class HS2 : MonoBehaviour {
 
     public Text highScoreText;
     public float highScoreCount;
     public GameObject highScore;
 
 
     private ScoreManager theScoreManager;
 
     // Use this for initialization
     void Start () {
         theScoreManager = FindObjectOfType<ScoreManager> ();
         if (PlayerPrefs.GetFloat ("hs1") != null) {
             highScoreCount = PlayerPrefs.GetFloat ("hs1");
         }
     }
 
     // Update is called once per frame
     void Update () {
         if (theScoreManager.scoreCount > highScoreCount) {
             highScoreCount = theScoreManager.scoreCount;
             PlayerPrefs.SetFloat ("hs1", highScoreCount);
         }
         highScoreText.text = "" + Mathf.Round (highScoreCount);
 
 
         Social.ReportScore (highScoreCount, rot.leaderboard_normal_mode, (bool success) => {
 
         });
     }
 }