rmd@rmd:~/Music/night$ musicxml2ly O\ Holy\ Night\ -\ NP.xml 
musicxml2ly: Reading MusicXML from O Holy Night - NP.xml ...
musicxml2ly: Converting to LilyPond expressions...
musicxml2ly: warning: Negative skip -3/2 (from position 249/2 to 123)
musicxml2ly: warning: Negative skip -9/8 (from position 993/8 to 123)


[ 350 similar errors]


musicxml2ly: Converting to LilyPond expressions...
musicxml2ly: Converting to LilyPond expressions...
musicxml2ly: warning: Negative skip -1 (from position 275/2 to 273/2)
musicxml2ly: Converting to LilyPond expressions...
Traceback (most recent call last):
  File "/usr/bin/musicxml2ly", line 2986, in <module>
    main()
  File "/usr/bin/musicxml2ly", line 2981, in main
    voices = convert (filename, options)
  File "/usr/bin/musicxml2ly", line 2892, in convert
    score = extract_score_structure (mxl_pl, staff_info)
  File "/usr/bin/musicxml2ly", line 430, in extract_score_structure
    staff = read_score_part (el)
  File "/usr/bin/musicxml2ly", line 383, in read_score_part
    staff.instrument_name = extract_display_text (partname)
  File "/usr/bin/musicxml2ly", line 907, in extract_display_text
    child = el.get_maybe_exist_named_child ("display-text")
  File "/usr/share/lilypond/2.18.2/python/musicxml.py", line 114, in get_maybe_exist_named_child
    return self.get_maybe_exist_typed_child (get_class (name))
  File "/usr/share/lilypond/2.18.2/python/musicxml.py", line 123, in get_maybe_exist_typed_child
    raise "More than 1 child", klass
TypeError: exceptions must be old-style classes or derived from BaseException, not str
rmd@rmd:~/Music/night$