Problem with GameJolt API - Doesn't knows GJAPI

Unity Engine
1

I have this code

using UnityEngine; 
using System.Collections;

public class GameJoltAPIManager : MonoBehaviour {
   
    public int gameID; 
    public string privateKey; 
    public string userName; 
    public string userToken;
   
    void Awake () { 
        DontDestroyOnLoad ( gameObject ); 
        GJAPI.Init ( gameID, privateKey ); 
        GJAPI.Users.Verify ( userName, userToken ); 
    }
   
    void OnEnable () {
        GJAPI.Users.VerifyCallback += OnVerifyUser;
    }
   
    void OnDisable () { 
        // Use this if you use the API v1.2.x
        GJAPI.Users.VerifyCallback -= OnVerifyUser;
       
        // Use this if you use the API v1.3.x
        if (GJAPI.Instance != null)
        {
            GJAPI.Users.VerifyCallback -= OnVerifyUser; 
        } 
    }
   
    void OnVerifyUser ( bool success ) { 
        if ( success ) { 
            Debug.Log ( "Yepee!" ); 
        } 
        else { 
            Debug.Log ( "Um... Something went wrong." ); 
        } 
    }
   
}

And i get Errors with every line of code there starts with " GJAPI " anyone who knows how to solve this?

2

Obvious question: Do you have a class file called GJAPI.cs added to your project?