Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/slide/SkillernChalloner_PCD1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2097-SkillernChalloner_PCD1.ps) >>/Users/jc/w/tmp/Tune-2097-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/slide/SkillernChalloner_PCD1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_20971.log 551422 Log file, useful mostly for debugging
Form_20970.log 893 Log file, useful mostly for debugging
Tune-2097-SkillernChalloner_PCD1.abc 160 ABC music file with the extracted tune(s)
Tune-2097-SkillernChalloner_PCD1.ps 6 PostScript
Tune-2097-SkillernChalloner_PCD1.txt 160 Plain-text file with the extracted tune(s)
Tune-2097-get.log 4322 Log file, useful mostly for debugging
Tune-20971-CSRHW-abc2.abc 147 ABC music file with the extracted tune(s)
Tune-20971-CSRHW-abc2.ps 6 PostScript
Tune-20971-CSRHW-abc2.txt 147 Plain-text file with the extracted tune(s)
Tune-20971-get.log 3993 Log file, useful mostly for debugging
Tune-20972-get.log 6088 Log file, useful mostly for debugging
Tune-20976-get.log 3148 Log file, useful mostly for debugging
Tune-20978-get.log 3170 Log file, useful mostly for debugging
These files should be available for 24 hours.