"501 Bad or Missing Parameters"

After downloading a .ISO file for 60+ hours (with only 2-3 hours remaining), a relative of mine turned off the PC. When i tried to resume the file, I ended up with the following error message:

501 Bad or Missing Parameters

Is there any way to resume this file?

If ANYONE could help me out, I'd be most appreciated, thank you :S

It is almost a month since my previous post and I was wondering whether anyone INCLUDING the smartftp staff would have any clue as to the reasons why this error occurs please. This is the fourth time that this has happened while I attempt to resume a file download. The first time was due to a relative of mine turning off the PC, and the second, third and fourth time is because I aborted the download so I could resume the download at a later point in time.

Here is a sample of a log of events (note certain details have been omitted):

227 Entering Passive Mode (##,###,##,###,###,##).
Opening data connection IP: ##.###.##.### PORT: #####.
REST 1576586128
350 REST supported. Ready to resume at byte offset 1576586128.
RETR <filename>.iso
150 Data connection accepted from ###.###.##.###:####; transfer starting for <filename>.iso (3963043840 bytes).
Command aborted by user.
ABOR
426 Cannot retrieve. Failed. Aborting
226 ABOR command successful.
NOOP
200 NOOP command successful.
PASV
227 Entering Passive Mode (##,###,##,###,###,###).
Opening data connection IP: ##.###.##.### PORT: #####.
REST 2247429008
501 Bad or missing parameters.
PASV

If ANYONE would have any information regarding this error, please let me know via this thread.

Thanks in Advance.

The FTP server doesnt support to resume files > 2 or 4GB

Regards.
-Mat