Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Form_69842.log 775 Log file, useful mostly for debugging
Tune-69842-Book4.abc 0 ABC music file with the extracted tune(s)
Tune-69842-Book4.txt 0 Plain-text file with the extracted tune(s)
Tune-69842-get.log 7210 Log file, useful mostly for debugging
These files should be available for 24 hours.