Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/_1850/BB50.abc"

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 ]
filesizedescription
Form_19976.log 1300 Log file, useful mostly for debugging
Tune-1997-BB50.abc 142 ABC music file with the extracted tune(s)
Tune-1997-BB50.txt 142 Plain-text file with the extracted tune(s)
Tune-1997-get.log 3043 Log file, useful mostly for debugging
Tune-19971-get.log 4770 Log file, useful mostly for debugging
Tune-19976-get.log 4861 Log file, useful mostly for debugging
Tune-19978-Pioneer.abc 144 ABC music file with the extracted tune(s)
Tune-19978-Pioneer.txt 144 Plain-text file with the extracted tune(s)
Tune-19978-get.log 3130 Log file, useful mostly for debugging
Tune-19979-get.log 3206 Log file, useful mostly for debugging
These files should be available for 24 hours.