FTP adapter --- Not picking up files

Hi,

I have set up an FTP adapter in archive mode to read files from FTP server and process it while archiving a copy of it. I have set up Poll interval at 40 secs and retry interval also set up. It works great the first time . Processes the file and archives it. But when the same files comes in again in the FTP server, I see the foll. message in the adapter monitor "Error: Stopped due to error: com.sap.aii.adapter.file.ftp.FTPEx: inputdat.txt: No such file or directory: No such file or directory."..The file exists in the FTP server but its not processed..I am not sure what I am missing...

-Teresa