[Hat] Strange error using hat-trail and hat-observe

I'm getting a very strange error when I run either of the main two hat utilities: dhcp2966:~/Documents/Work/SECD Machine tatd100$ hat-trail SECDmachine Fail: /tmp/hmakeconfig.1273: removeFile: failed (Bad file descriptor) I've been searching and searching for where either tool tries to delete anything, but can't find a thing. Any help much appreciated. Thanks Bob