Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1792/JamesJohnson_ScotsMusicalMuseumV4-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-66752-JamesJohnson_ScotsMusicalMuseumV4-V2.ps) >>/Users/jc/w/tmp/Tune-66752-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1792/JamesJohnson_ScotsMusicalMuseumV4-V2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_66752.log 941 Log file, useful mostly for debugging
Tune-66752-078_Tom_Thumb-001.svg 20129 Scalable Vector Graphics format
Tune-66752-078_Tom_Thumb.abc 686 ABC music file with the extracted tune(s)
Tune-66752-078_Tom_Thumb.txt 686 Plain-text file with the extracted tune(s)
Tune-66752-JamesJohnson_ScotsMusicalMuseumV4-V2.abc 173 ABC music file with the extracted tune(s)
Tune-66752-JamesJohnson_ScotsMusicalMuseumV4-V2.ps 6 PostScript
Tune-66752-JamesJohnson_ScotsMusicalMuseumV4-V2.txt 173 Plain-text file with the extracted tune(s)
Tune-66752-get.log 8848 Log file, useful mostly for debugging
These files should be available for 24 hours.