Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/GM/Trip_to_Hanover.abc/1750"

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 ]
filesizedescription
Coll_42811.log 433210 Log file, useful mostly for debugging
Tune-42811-1750.abc 155 ABC music file with the extracted tune(s)
Tune-42811-1750.txt 155 Plain-text file with the extracted tune(s)
Tune-42811-get.log 3089 Log file, useful mostly for debugging
These files should be available for 24 hours.