Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Tweed1/MSRPB.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5018-MSRPB.ps) >>/Users/jc/w/tmp/Tune-5018-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Tweed1/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
Coll_50187.log 259610 Log file, useful mostly for debugging
Tune-5018-MSRPB.abc 144 ABC music file with the extracted tune(s)
Tune-5018-MSRPB.ps 6 PostScript
Tune-5018-MSRPB.txt 144 Plain-text file with the extracted tune(s)
Tune-5018-get.log 3971 Log file, useful mostly for debugging
Tune-50185-_.abc 138 ABC music file with the extracted tune(s)
Tune-50185-_.ps 6 PostScript
Tune-50185-_.txt 138 Plain-text file with the extracted tune(s)
Tune-50185-get.log 3921 Log file, useful mostly for debugging
Tune-50186-Remick.abc 145 ABC music file with the extracted tune(s)
Tune-50186-Remick.pdf 2217 Portable Data Format
Tune-50186-Remick.ps 6 PostScript
Tune-50186-Remick.txt 145 Plain-text file with the extracted tune(s)
Tune-50186-get.log 4776 Log file, useful mostly for debugging
Tune-50187-get.log 33171 Log file, useful mostly for debugging
Tune-50188-get.log 3070 Log file, useful mostly for debugging
These files should be available for 24 hours.