midicmd="abc2midi /Users/jc/w/tmp/Tune-551-Matchmaker_The_1.abc -v -o /Users/jc/w/tmp/Tune-551-Matchmaker_The_1.midi >>/Users/jc/w/tmp/Tune-551-get.log 2>&1" returned status 256.

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Coll_55145.log 135547 Log file, useful mostly for debugging
Form_55113.log 832 Log file, useful mostly for debugging
Form_55177.log 803 Log file, useful mostly for debugging
Form_55191.log 848 Log file, useful mostly for debugging
Tune-551-Matchmaker_The_1.abc 768 ABC music file with the extracted tune(s)
Tune-551-Matchmaker_The_1.malt 0 Musical Instrument Digital Interface, alternate name for midi format
Tune-551-Matchmaker_The_1.mid 0 Musical Instrument Digital interface, shortened name for midi format
Tune-551-Matchmaker_The_1.midi 0 Musical Instrument Digital Interface, electronic version of the tune(s)
Tune-551-Matchmaker_The_1.txt 768 Plain-text file with the extracted tune(s)
Tune-551-get.log 1890 Log file, useful mostly for debugging
Tune-55100-Kerr_MM1-V2.abc 537 ABC music file with the extracted tune(s)
Tune-55100-Kerr_MM1-V2.txt 537 Plain-text file with the extracted tune(s)
Tune-55100-get.log 170154 Log file, useful mostly for debugging
Tune-55110-get.log 4175 Log file, useful mostly for debugging
Tune-55114-get.log 4563 Log file, useful mostly for debugging
Tune-55120-get.log 4279 Log file, useful mostly for debugging
Tune-55135-get.log 5879 Log file, useful mostly for debugging
Tune-55142-get.log 2979 Log file, useful mostly for debugging
Tune-55147-get.log 6881 Log file, useful mostly for debugging
Tune-55152-get.log 3118 Log file, useful mostly for debugging
Tune-55153-get.log 3583 Log file, useful mostly for debugging
Tune-55156-get.log 82102 Log file, useful mostly for debugging
These files should be available for 24 hours.