Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/abc/Scotland/event/20180406/Sailor.abc"
X:3 not found in http://john-chambers.us/~jc/music/abc/Scotland/event/20180406/Sailor.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-38545-Sailor.ps) >>/Users/jc/w/tmp/Tune-38545-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/event/20180406/Sailor.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_38545.log 284021 Log file, useful mostly for debugging
Tune-38545-Sailor.abc 0 ABC music file with the extracted tune(s)
Tune-38545-Sailor.ps 6 PostScript
Tune-38545-Sailor.txt 0 Plain-text file with the extracted tune(s)
Tune-38545-get.log 4464 Log file, useful mostly for debugging
These files should be available for 24 hours.