midicmd="abc2midi /u/guests/jc/w/tmp/Tune-74659-melnets_big_abc_file.abc -v -o /u/guests/jc/w/tmp/Tune-74659-melnets_big_abc_file.midi >>/u/guests/jc/w/tmp/Tune-74659-get.log 2>&1" returned status 11.

Error exit status 11; here are some files to check:
[get.cgi V=1/1 B=1 scale=0.65 512x512 ]
filesizedescription
Tune-74659-get.log 3771 Log file, useful mostly for debugging
Tune-74659-melnets_big_abc_file.abc 291 ABC music file with the extracted tune(s)
Tune-74659-melnets_big_abc_file.txt 291 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.