SFTP Plugin is not working

Hi,

I am getting following error while using the SFTP function though credentials & file type is correct.

I have tried with basic credential as well as with scs key.

" Error copying the Appian document to the remote server. See application server log for more details. Error Message: No such file"

using 17.3 Appian version- On premise

SFTP Functions (v1.6.2) [com.appiancorp.a2.process.runtime.activities.sftp]

Send File Over SFTP,

Send File Over SFTP (Basic Credentials),

Can you please suggest on this asap