something is wrong with my code cant find out...i am a newbie

my GameManager script is

public class GameManager : MonoBehaviour {

 public static GameManager instance;

 [HideInInspector]
 public bool gameStartFromMainMenu, gameRestartedAfterPlayerDied;

 [HideInInspector]
 public int score, coinScore, lifeScore;

 void Awake () {
     MakeSingleton();
 }
 

void OnEnable() { SceneManager.sceneLoaded += LevelFinishedLoading;

 }
 void OnDisable()
 {
     SceneManager.sceneLoaded -= LevelFinishedLoading;

 }

 void LevelFinishedLoading(Scene scene, LoadSceneMode mode)
 {
 
     if (SceneManager.GetActiveScene() == SceneManager.GetSceneByName("Gameplay"))
     {
         if (gameRestartedAfterPlayerDied)
         {
             GameplayController.instance.SetScore(score);
             GameplayController.instance.SetCoinScore(coinScore);
             GameplayController.instance.SetLifeScore(lifeScore);

             PlayerScore.scoreCount = score;
             PlayerScore.coinCount = coinScore;
             PlayerScore.lifeCount = lifeScore;
         }
         else if (gameStartFromMainMenu)
         {      

             PlayerScore.scoreCount = 0;
             PlayerScore.coinCount = 0;
             PlayerScore.lifeCount = 2;

             GameplayController.instance.SetScore(0);
             GameplayController.instance.SetCoinScore(0);
             GameplayController.instance.SetLifeScore(2);
         }                           
               

     }
 }

 // Update is called once per frame
 void MakeSingleton () {
     if (instance != null)
     {
                     Destroy(gameObject);
     }
         else
     {
         instance = this;
         DontDestroyOnLoad(gameObject);
     }

 }
 public void CheckGameStatus(int score, int coinScore, int lifeScore)
 {
     if (lifeScore < 0)
     {
         gameStartFromMainMenu = false;
         gameRestartedAfterPlayerDied = false;

         GameplayController.instance.GameOverShowPanel(score, coinScore);
     }
     else
     {
         this.score = score;
         this.lifeScore = lifeScore;
         this.coinScore = coinScore;

         GameplayController.instance.SetScore(score);
         GameplayController.instance.SetLifeScore(lifeScore);
         GameplayController.instance.SetCoinScore(coinScore);

         gameStartFromMainMenu = false;
         gameRestartedAfterPlayerDied = true;

         GameplayController.instance.PlayerDiedRestartTheGame();
     }
 }

but when i use GameManager.instance.CheckGameStatus(scoreCount, coinCount, lifeCount);

in other scripts it give me an error ....pls can anyone help