Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1759/Kerr_MM3-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5168-Kerr_MM3-V1.ps) >>/Users/jc/w/tmp/Tune-5168-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1759/Kerr_MM3-V1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-5168-Kerr_MM3-V1.abc 148 ABC music file with the extracted tune(s)
Tune-5168-Kerr_MM3-V1.ps 6 PostScript
Tune-5168-Kerr_MM3-V1.txt 148 Plain-text file with the extracted tune(s)
Tune-5168-get.log 4083 Log file, useful mostly for debugging
Tune-51683-20081_Gilderoy.abc 648 ABC music file with the extracted tune(s)
Tune-51683-20081_Gilderoy.txt 648 Plain-text file with the extracted tune(s)
Tune-51683-get.log 3164 Log file, useful mostly for debugging
Tune-51689-20211_Burditts_March.abc 834 ABC music file with the extracted tune(s)
Tune-51689-20211_Burditts_March.ps 37100 PostScript
Tune-51689-20211_Burditts_March.txt 834 Plain-text file with the extracted tune(s)
Tune-51689-get.log 4871 Log file, useful mostly for debugging
These files should be available for 24 hours.