Mismatch: X:843 doesn't match requested X:646
X:646 not found in http://colinhume.com/ABC.txt

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Form_83691.log 946 Log file, useful mostly for debugging
Form_83694.log 927 Log file, useful mostly for debugging
Tune-8369-ABC.abc 0 ABC music file with the extracted tune(s)
Tune-8369-ABC.txt 0 Plain-text file with the extracted tune(s)
Tune-8369-get.log 577745 Log file, useful mostly for debugging
Tune-83690-get.log 72329 Log file, useful mostly for debugging
Tune-83690-l.abc 310 ABC music file with the extracted tune(s)
Tune-83690-l.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-83690-l.ps 33119 PostScript
Tune-83690-l.txt 310 Plain-text file with the extracted tune(s)
Tune-83691-DinkysReel_A-001.svg 36479 Scalable Vector Graphics format
Tune-83691-DinkysReel_A.abc 715 ABC music file with the extracted tune(s)
Tune-83691-DinkysReel_A.txt 715 Plain-text file with the extracted tune(s)
Tune-83691-get.log 4115 Log file, useful mostly for debugging
Tune-83694-get.log 137175 Log file, useful mostly for debugging
Tune-83698-get.log 3269 Log file, useful mostly for debugging
These files should be available for 24 hours.