C#

Hi Friends, am using WinSCP library to upload/download files to/from FTPS server. 

Am able to download the files from SFTP. Buy when am try to upload the files to SFTP server am getting following exception. 

Can any one help me to resolve this issue...

WinSCP.SessionRemoteException: Error transferring file 'd:\SFTPFiles\SampleText.doc'. ---> WinSCP.SessionRemoteException: Copying files to remote side failed.


Thanks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ScaleCalc.scaletoolsutility
{
    class testScaleCalcUtils1
    {
        static void Main()
        {
            string stw;
            string st1 = "1/32";
          // this also causes exception 
  
          stw = st1.Substring(1,st1.length -1);
  
         // this causes an exception
           stw = st1.Substring(2, 3);

            Console.WriteLine(stw);


        }
    }
}