X:420 not found in http://lesters-tune-a-day.blogspot.co.uk/2015/
pscmd="(jcabc2ps /Users/jc/w/tmp/Tune-7727-2015.abc -F fmt/pdf_60.fmt +s 0.60 +maxs 2000 )>/Users/jc/w/tmp/Tune-7727-2015.ps 2>>/Users/jc/w/tmp/Tune-7727-get.log" returned status 256.
http://lesters-tune-a-day.blogspot.co.uk/2015/

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Coll_77270.log 1001641 Log file, useful mostly for debugging
Coll_77276.log 270429 Log file, useful mostly for debugging
Coll_77277.log 0 Log file, useful mostly for debugging
Form_77276.log 860 Log file, useful mostly for debugging
Tune-7727-2015.abc 0 ABC music file with the extracted tune(s)
Tune-7727-get.log 8027 Log file, useful mostly for debugging
Tune-77270-get.log 10352 Log file, useful mostly for debugging
Tune-77276-get.log 5069 Log file, useful mostly for debugging
These files should be available for 24 hours.