مشکل در برنامه نویسی ربات تلگرام

an error occurred while sending the request.
at system.runtime.compilerservices.taskawaiter.throwf roNonSuccess<task task
at system.runtime.compilerservice.taskawaiter.handleN onsuccessAndDebuggerNotification<Task task
at system.runtime.compilerservice..configuredtaskawai table`1.configuredtaskawaiter.getresult<>
at NetTelegramBotApi.telegramBot.<MakerequestAsync d___9`1.moveNext

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using NetTelegramBotApi;

using NetTelegramBotApi.Requests;

using NetTelegramBotApi.Types;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

//using TelegramBotSharp;

//using TelegramBotSharp.Types;



 

 

 

 

namespace testBot

{

    class Program

    {

        public static TelegramBot bot;

        public static NetTelegramBotApi.Types.ReplyKeyboardMarkup rkm = new ReplyKeyboardMarkup();

 

        static void Main(string[] args)

        {

            bot = new TelegramBot("423986824:AAHPcaXbxLo6eOdpsc-2CC7rsPEmrfZb1d4");

            rkm.Keyboard =

    new KeyboardButton[][]

    {

        new KeyboardButton[]

        {

            new KeyboardButton("U0001F602 راهنما") ,

            new KeyboardButton("U0001F4AC درباره ما")

 

        },

 

        new KeyboardButton[]

        {

            new KeyboardButton("U0001F4D5 آموزش")

        },

 

        new KeyboardButton[]

        {

            new KeyboardButton(" U0001F393 اساتید"),

            new KeyboardButton("U0001F3E6 سمینار "),

            new KeyboardButton("U0001F3B8 زمانبندی")

        },

         new KeyboardButton[]

                    {

                        new KeyboardButton("shared your contact")

                         {

                            RequestContact = true

 

                         }

                    }

 

    };

            try

            {

 

 

                Task.Run(() => RunBot());

                Console.ReadLine();

            }

            catch(Exception ex)

            {

                Console.WriteLine(ex.Message );

                Console.WriteLine(ex.StackTrace);

            }

        }

 

        public static async Task RunBot()

        {

 

            try

            {

                var me = await bot.MakeRequestAsync(new GetMe());

                Console.WriteLine("username is {0}", me.Username);

 

                long offset = 0;

                int count = 0;

                while (true)

                {

                    var updates = await bot.MakeRequestAsync(new GetUpdates() { Offset = offset });

 

                    foreach (var update in updates)

                    {

 

 

                        offset = update.UpdateId + 1;

                        var text = update.Message.Text;

                        Console.WriteLine(text);

                        if (text == null)

                        {

                      

                            continue;

                        }

                        else if (text == "/start")

                        {

                            var req = new SendMessage(update.Message.Chat.Id, "Hello") { ReplyMarkup = rkm };

                       

                            await bot.MakeRequestAsync(req);

                            continue;

                        }

                        else if (text == "U0001F4AC درباره ما")

                        {

                            var req = new SendMessage(update.Message.Chat.Id, "ربات تلگرام") { ReplyMarkup = rkm };

                            await bot.MakeRequestAsync(req);

                            continue;

                        }

                        else

                        {

                            var req = new SendMessage(update.Message.Chat.Id, "مقدار غیر مجاز وارد شده است") { ReplyMarkup = rkm };

                            await bot.MakeRequestAsync(req);

                            continue;

                        }

 

                    }

                }

            }

            catch (TimeoutException time)

            {

                Console.WriteLine(1);

                Console.WriteLine(time.Message );

            }

            catch (MessageLockLostException locks)

            {

                Console.WriteLine(2);

                Console.WriteLine(locks.Message);

            }

            catch (RedisCoectionException redis)

            {

                Console.WriteLine("Start the redis server service!");

            }

            catch (MessagingCommunicationException communication)

            {

                Console.WriteLine(3);

                Console.WriteLine(communication.Message);

            }

            catch (Exception ex)

            {

                Console.WriteLine(4);

                Console.WriteLine(ex.Message);

                Console.WriteLine(ex.StackTrace);

               

            }

        }

    }

}