Hi, Danny-
Hmm, OK.
First to note: those "Step ..." references are just to help pinpoint in the code which step failed, for someone looking through the @SSwarper tcsh script itself. That particular step is inverting a warp... Do you happen to have log file of the full terminal output from running that command?
Also, if I shared instructions, would you be able to send me that dataset to check out?
--pt