pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9543-Redwings.ps) >>/Users/jc/w/tmp/Tune-9543-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/NYE_20191231/Redwings.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_9543.log 147647 Log file, useful mostly for debugging
Coll_95431.log 144622 Log file, useful mostly for debugging
Coll_95436.log 401323 Log file, useful mostly for debugging
Coll_95439.log 62922 Log file, useful mostly for debugging
Form_95430.log 899 Log file, useful mostly for debugging
Tune-9543-Redwings.abc 544 ABC music file with the extracted tune(s)
Tune-9543-Redwings.ps 34946 PostScript
Tune-9543-Redwings.txt 544 Plain-text file with the extracted tune(s)
Tune-9543-get.log 4334 Log file, useful mostly for debugging
These files should be available for 24 hours.