Client Access Transfer is looking for an “.FDF” file – This describes the transfer information.
Either it’s been moved or erased on the client machine.
You can create an FDF file during a download to the client machine.
So reverse the normal process – download to the pc from the desired AS/400 file
with the PC spec’s like you would latter upload and select the box – create FDF
you will need atleast one record in the AS/400 file. And take care not to overwrite the good client data file.
Once the FDF is recreated you should be able to upload.
Here’s another discussion of this subject.