How to properly initialize an object?

Question

.NET

It throws an error when I try to subscribe to an event.

System.NullReferenceException: 'Object reference not set to an instance of an object.'


Instance.manager.Subscribe<SteamClient.ConnectedCallback>(BinVerify.OnConnected);

The event for the subscription.

public static void OnConnected(SteamClient.ConnectedCallback callback)
        {
            Console.WriteLine($"Connected to Steam! Logging in '{Instance.botConfig.login}'...");
            byte[] sentryHash = null;
            if (File.Exists("sentry.bin"))
            {
                // if we have a saved sentry file, read and sha-1 hash it
                byte[] sentryFile = File.ReadAllBytes("sentry.bin");
                sentryHash = CryptoHelper.SHAHash(sentryFile);
            }
            Instance.steamUser.LogOn(new SteamUser.LogOnDetails
            {
                Username = Instance.botConfig.login,
                Password = Instance.botConfig.password,
                // in this sample, we pass in an additional authcode
                // this value will be null (which is the default) for our first logon attempt
                AuthCode = Instance.authCode,
                TwoFactorCode = Instance.twoFactorAuth,

                // our subsequent logons use the hash of the sentry file as proof of ownership of the file
                // this will also be null for our first (no authcode) and second (authcode only) logon attempts
                SentryFileHash = sentryHash,
                ClientLanguage = "Russian"
            });
        }

Instance is just a container of objects where all the data is.