text: I m trying to run a shell script which is just doing a ls
  in it. The script runs perfectly fine when ran directly from root dir as sh test.sh
  Please attach a full session log file showing the problem (using the latest version of WinSCP).
  To generate the session log file, set Session.SessionLogPath
  . Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.
  Also where does the output your have posted come from? How did you obtain it? It's a strange combination of WinSCP scripting output and .NET exception.