Chilkat shows file upload successful but getting 500 Syntax error , Command unrecognized in FTPS Log

Using Chilkat File uploaded showing successful. But when file has been actually uploaded in the FTPS server. FTPS server log it shows "500 syntax error, command un-recognized".

Below is the Code Snippet used for uploading the File -

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

            bool success;

            //  Any string unlocks the component for the 1st 30-days.
            success = ftp.UnlockComponent("Anything for 30-day trial");
            if (success != true)
            {
                Console.WriteLine(ftp.LastErrorText);
                return ftp.LastErrorText;
            }

            //  If this example does not work, try using passive mode
            //  by setting this to true.
            ftp.Passive = true;
            ftp.Hostname = parameters.HostName;
            ftp.Username = parameters.UserName;
            ftp.Password = parameters.Password;
            ftp.Port = 20017;

            //  We don't want AUTH SSL:
            ftp.AuthTls = false;

            //  We want Implicit SSL:
            ftp.Ssl = true;

            //  Connect and login to the FTP server.
            success = ftp.Connect();
            if (success != true)
            {
                Console.WriteLine(ftp.LastErrorText);
                ftp.Disconnect();
                return ftp.LastErrorText;
            }
            else
            {
                //  LastErrorText contains information even when
                //  successful. This allows you to visually verify
                //  that the secure connection actually occurred.
                Console.WriteLine(ftp.LastErrorText);
                Console.WriteLine("FTPS Channel Established!");

                success = ftp.ChangeRemoteDir("/");
                if (success != true)
                {
                    return ftp.LastErrorText;//Directory Change Error.

                }
                else
                {

                    ftp.PassiveUseHostAddr = true;
                    success = ftp.PutFile("C:\\Test\\test.txt", "test.txt");

                    if (success != true)
                    {
                        //ftp.Disconnect();
                        return  "---------Upload Error  --------- " + ftp.LastErrorText + "---" ;//Upload Error.
                    }
                    else
                    {
                        ftp.Disconnect();
                        return "File Uploaded sucessfully.";
                    }

                }
            }