musicxml2ly from sibelius

[Josiah Boothby]

A composer recently gave me a messy part he'd prepared with Sibelius,
and I asked him for a musicxml file on the off chance that it might
work in Lilypond and I could clean it up. With Lilypond 2.15.36
(Slackware 13.37, x86), I get the error below along with no output
file. I tried the prebuilt lilypond stable as well, and the only
difference in the console output are line numbers in the musicxml2ly
script. Should I send this to the bugs list, or is there something I
can do as a user (without access to Sibelius) to improve the
likelihood of getting this to work?

# # # # # Console Output

$ musicxml2ly -v --loglevel=DEBUG --nd --nrp --npl --no-beaming -o
moore.ly moore.xml
Setting loglevel to DEBUG
musicxml2ly: Reading MusicXML from moore.xml ...
musicxml2ly: Converting to LilyPond expressions...
Traceback (most recent call last):
  File "/usr/bin/musicxml2ly", line 2984, in <module>
    main()
  File "/usr/bin/musicxml2ly", line 2979, in main
    voices = convert (filename, options)
  File "/usr/bin/musicxml2ly", line 2885, in convert
    (voices, staff_info) = get_all_voices (parts)
  File "/usr/bin/musicxml2ly", line 2572, in get_all_voices
    part_ly_voices[n] = musicxml_voice_to_lily_voice (v)
  File "/usr/bin/musicxml2ly", line 2174, in musicxml_voice_to_lily_voice
    for a in musicxml_direction_to_lily (n):
  File "/usr/bin/musicxml2ly", line 1534, in musicxml_direction_to_lily
    ev = tmp_tp (entry)
  File "/usr/bin/musicxml2ly", line 1465, in musicxml_metronome_to_ly
    if isinstance (children[index], musicxml.BeatUnitDot):
IndexError: list index out of range

# # # # # End Console Output