At first it seems like terrible news and you get the impression that FTP does not work for your acc
but try to ignore it.
That error is actually related to how some items within the client area communicate with each other, check and work internally
which sometimes for various reasons are unable to complete the task
But in 99% of cases, I’m sure that your FTP works, which you can check by starting file manager (monsta FTP) or another FTP client