I've just started learning to use IRAF to process images. Everything was working fine until I tried to perform a dark subtraction with ccdproc. I got the error message "HDMGETR: No value found" and for the life of me I can't figure out what's wrong. This occurs when I try to use a list or just a single image. Any insight would be appreciated! Thanks!

A quick search of the archives turned up the following:

http://iraf.net/phpBB2/viewtopic.php?t=80916&highlight=hdmgetr

Followup if this doesn't solve it for you.

-Mike