Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book18/HibernianMuse-V2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-495-HibernianMuse-V2.ps) >>/Users/jc/w/tmp/Tune-495-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book18/HibernianMuse-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
Coll_49547.log 133936 Log file, useful mostly for debugging
Coll_49560.log 348963 Log file, useful mostly for debugging
Coll_49572.log 261853 Log file, useful mostly for debugging
Tune-495-HibernianMuse-V2.abc 155 ABC music file with the extracted tune(s)
Tune-495-HibernianMuse-V2.ps 6 PostScript
Tune-495-HibernianMuse-V2.txt 155 Plain-text file with the extracted tune(s)
Tune-495-get.log 4187 Log file, useful mostly for debugging
Tune-49584-get.log 4758 Log file, useful mostly for debugging
These files should be available for 24 hours.