Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1780/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6841-MSRPB.ps) >>/Users/jc/w/tmp/Tune-6841-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1780/MSRPB.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Find_68419.log 1457 Log file, useful mostly for debugging
Form_68410.log 936 Log file, useful mostly for debugging
Tune-6841-MSRPB.abc 142 ABC music file with the extracted tune(s)
Tune-6841-MSRPB.ps 6 PostScript
Tune-6841-MSRPB.txt 142 Plain-text file with the extracted tune(s)
Tune-6841-get.log 3961 Log file, useful mostly for debugging
Tune-68417-get.log 4782 Log file, useful mostly for debugging
These files should be available for 24 hours.