我正在嘗試從我的GameController.cs腳本訪問協程，協程位于我的DatabaseManager.cs腳本中。我正在嘗試像這樣訪問協程： DatabaseManager d1 = new DatabaseManager(); d1.uploadData();這給了我一個空引用異常。我知道在我嘗試訪問的協程中一切正常，因為這些腳本與我制作的另一個項目完全相同，唯一的區別是在另一個項目中我通過一個運行良好的動畫事件調用協程，但是試圖通過這個項目中的代碼調用它給了我這個問題。數據庫管理器腳本附加到 Player 游戲對象數據庫管理器腳本using UnityEngine;using UnityEngine.Networking;using System.Collections;using UnityEngine.UI;using CompanionLibrary; //include my library to utilise its functions//use neccessary libraries.    //This class handles sending game data to the database.    public class DatabaseManager : MonoBehaviour    {        //declare variables to hold data values.        static string username;        string password;        int score =0;        int kills=0;  //initialise variables to 0         int bulletsFired=0;        int bulletsHit=0;        int bulletsMissed=0;        int timePlayed = 0;        int scorePerMin=0;        StatGeneration companion = new StatGeneration();        //On awake function to check if sign in or logged in booleans are set.        public void Awake()        {        if (ButtonManagers.signedUp == true) //if signedUp boolean is true....            {                username = ButtonManagers.signUpUsername; //assign the username to equal the signUpUsername value.                password = ButtonManagers.signUpPassword; //assign the password to equal the signUpPassword value.            Debug.Log("Username: " + username);            Debug.Log("Password: " + password);        }            //if loggedIn boolean is true....            if (ButtonManagers.loggedIn == true)            {                username = ButtonManagers.loginUsername;//assign the username to equal the loggedInUsername value.                password = ButtonManagers.loginPassword;//assign the password to equal the loggedInPassword value.            }        }