Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-1889-ThomasMarsden.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2541-Tune-1889-ThomasMarsden.ps) >>/Users/jc/w/tmp/Tune-2541-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Stewart/Riddell/tmp/Tune-1889-ThomasMarsden.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_25410.log 987 Log file, useful mostly for debugging
Form_25413.log 1007 Log file, useful mostly for debugging
Form_25414.log 976 Log file, useful mostly for debugging
Form_25415.log 970 Log file, useful mostly for debugging
Form_25417.log 876 Log file, useful mostly for debugging
Form_25419.log 971 Log file, useful mostly for debugging
Tune-2541-Tune-1889-ThomasMarsden.abc 175 ABC music file with the extracted tune(s)
Tune-2541-Tune-1889-ThomasMarsden.ps 6 PostScript
Tune-2541-Tune-1889-ThomasMarsden.txt 175 Plain-text file with the extracted tune(s)
Tune-2541-get.log 4429 Log file, useful mostly for debugging
Tune-25411-get.log 1483 Log file, useful mostly for debugging
These files should be available for 24 hours.