[Ifeffit] errors = 0?

Hi, I'm hoping someone out there has seen this before and can tell me what to do to remedy it... I've been using artemis at home all weekend on my Win 98 computer without incident.... now I'm working at home today with the same feff and data files working on fitting... and while Chi sq etc. is the same the +/- values on all my variables are now reading as 0, even though the values for the variables are what I would expect them to be. Any ideas about how I can fix this? Thanks, Kristine Witkowski Northwestern University