You are receiving this error because the script it performing a $read on the file "c:\program files\xdcc klipper\keywords.tmp" which does not exist.
Since 7.1 mIRC now returns an error instead of returning $null.
You should probably check the script and adjust it, or contact the person who wrote it.
Scripts should not perform $reads on files that do not exist, or should at least first check if they do exist.
