Assessment failed error

My assessment is failing for the confirm_client_server_communication i.e Milestone #2.
I can see the entry of upload.txt file and download.txt file in vsftpd.log file and i have copied the log file to client_server folder as well. Here are the screenshots of my unitTesting file and vsftpd_log file.

I am not able to understand what is the issue and also i have searched in discussion forum for answer but no able to find any solution.

You say you have searched the forum but I am not convinced. Check the below link :