Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/abc/Scotland/program/20200127/GG2.abc"
X:2 not found in http://john-chambers.us/~jc/music/abc/Scotland/program/20200127/GG2.abc
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-229-GG2.ps) >>/Users/jc/w/tmp/Tune-229-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/program/20200127/GG2.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_22917.log 18816 Log file, useful mostly for debugging
Form_22907.log 911 Log file, useful mostly for debugging
Form_2291.log 917 Log file, useful mostly for debugging
Form_22927.log 925 Log file, useful mostly for debugging
Form_2298.log 920 Log file, useful mostly for debugging
Tune-229-GG2.abc 0 ABC music file with the extracted tune(s)
Tune-229-GG2.ps 6 PostScript
Tune-229-GG2.txt 0 Plain-text file with the extracted tune(s)
Tune-229-get.log 4371 Log file, useful mostly for debugging
Tune-22916-get.log 3318 Log file, useful mostly for debugging
Tune-22945-get.log 81545 Log file, useful mostly for debugging
Tune-22952-get.log 5140 Log file, useful mostly for debugging
Tune-22976-get.log 4455 Log file, useful mostly for debugging
These files should be available for 24 hours.