System.IO.IOException: 'Unable to remove the file to be replaced. ' about wtelegramclient HOT 9 CLOSED

        private string Config(string what)
        {
            switch (what)
            {
                case "api_id": return "HIDDEN";
                case "api_hash": return "HIDDEN";
                case "phone_number": return "HIDDEN";
                case "verification_code": MessageBox.Show("Enter code"); return textBox1.Text;
                case "first_name": return "Acid";      // if sign-up is required
                case "last_name": return "";        // if sign-up is required
                case "password": return "";     // if user has enabled 2FA
                default: return null;                  // let WTelegramClient decide the default config
            }
        }

            new Thread(() =>
            {
                Executer();
            }).Start();

partitipants = await telegramClient.Channels_GetParticipants(channelinput, null, offset, 50, 0);

And

messagebase = await telegramClient.Messages_Search(inputPeer, "", null, new DateTime(2018, 1, 1), DateTime.Now, 0, 0, 5, 0, 0, 0, participant.Value.ToInputPeer());

        private async void Executer()
        {
            InputPeerChannel inputPeer = new InputPeerChannel();
            inputPeer.access_hash = accesshash;
            inputPeer.channel_id = channelID;

            InputChannel channelinput = new InputChannel();
            channelinput.access_hash = accesshash;
            channelinput.channel_id = channelID;


            textBox2.Text = "UserID | FirstName | Username | Inactivity | Total Messages | Member For" + Environment.NewLine;

            int offset = 0, checkedUsers = 0;
            while (true)
            {
                try
                {
                    Channels_ChannelParticipants partitipants = null;
                    while (true) // to solve the crashing
                    {
                        try
                        {
                            Thread.Sleep(500);
                            partitipants = await telegramClient.Channels_GetParticipants(channelinput, null, offset, 50, 0);
                            break;
                        }
                        catch
                        {

                        }
                       
                    }

                    if (partitipants.users.Count < 1) // no members left to check
                        break;

                    foreach (var participant in partitipants.users) // members of the group 
                    {
                        Messages_MessagesBase messagebase = null;
                        while (true) // to bypass the crashing, getting user messages
                        {
                            Thread.Sleep(300);
                            try
                            {
                                messagebase = await telegramClient.Messages_Search(inputPeer, "", null, new DateTime(2018, 1, 1), DateTime.Now, 0, 0, 5, 0, 0, 0, participant.Value.ToInputPeer());
                                break;
                            }
                            catch
                            {

                            }
                        }
                        
                        if (messagebase.Count > 0)
                        {
                            var messageBase = messagebase.Messages[0]; // most recent message
                            if (GetTimeStamp(messageBase.Date) > ((24 * 60 * 60) * 7)) // 7 days ago
                            {
                                User fullUser = (User)participant.Value;

                                DateTime joinedOn;

                                ChannelParticipantBase partibase = partitipants.participants.FirstOrDefault(t => // find user join date
                                {
                                    try
                                    {
                                        ChannelParticipant partiti = (ChannelParticipant)t; // might crash if participant is admin
                                        if (partiti.user_id == participant.Value.ID)
                                        {
                                            return true;
                                        }
                                    }
                                    catch
                                    {

                                    }
                                    return false;
                                });

                                ChannelParticipant partici = null;
                                try
                                {
                                    partici = (ChannelParticipant)partibase;
                                }
                                catch
                                {

                                }

                                if (partici != null) // found user's join date ( not admin and not self )
                                {
                                    joinedOn = partici.date;
                                    textBox2.Text += fullUser.id + " | " + fullUser.first_name + " | @" + fullUser.username + " | " + GetDays(messageBase.Date) + " Days | " + messagebase.Count + " | " + GetDays(joinedOn) + " Days" + Environment.NewLine;
                                }
                                else
                                {
                                    textBox2.Text += fullUser.id + " | " + fullUser.first_name + " | @" + fullUser.username + " | " + GetDays(messageBase.Date) + " Days | " + messagebase.Count + " | Unknown" + Environment.NewLine;
                                }
                            }
                            offset++;
                        }
                        else // never sent a message in the group
                        {
                            long howManyDays = 0;
                            if (partitipants.participants.FirstOrDefault(t => // find join date
                            {
                                try
                                {
                                    ChannelParticipant partiti = (ChannelParticipant)t; // might be admin or self, will crash
                                    if (partiti.user_id == participant.Value.ID)
                                    {
                                        howManyDays = GetDays(partiti.date); // count days since user's join
                                        if (howManyDays > 3)
                                        {
                                            return true;
                                        }
                                    }
                                }
                                catch
                                {

                                }
                                return false;
                            }) != null) // joined more than 3 days ago, no messages
                            {
                                User fullUser = (User)participant.Value;
                                textBox2.Text += fullUser.id + " | " + fullUser.first_name + " | @" + fullUser.username + " | Never | " + messagebase.Count + " | " + howManyDays + " Days" + Environment.NewLine;
                            }
                            offset++;
                        }
                        checkedUsers++;
                        label3.Text = checkedUsers.ToString();
                    }
                }
                catch(Exception e)
                {
                    MessageBox.Show(e.Message);
                }
            }

            MessageBox.Show("Finished");
        }