pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-32485-FillTheFetters2.ps) >>/Users/jc/w/tmp/Tune-32485-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/event/20180706/FillTheFetters2.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
Tune-32485-FillTheFetters2.abc 678 ABC music file with the extracted tune(s)
Tune-32485-FillTheFetters2.ps 37146 PostScript
Tune-32485-FillTheFetters2.txt 678 Plain-text file with the extracted tune(s)
Tune-32485-get.log 4566 Log file, useful mostly for debugging
These files should be available for 24 hours.