Incompatibility lilypond-book / tikz

[Francisco Vila]

Hello.
Just writing in a LaTeX document

  \usepackage{tikz}

to make pgf drawings, makes lilypond-book to fail with the message

textwidth=345.0pt
columnsep=10.0pt
(./tmpZHQYhJ.aux) )
No pages of output.
Transcript written on tmpZHQYhJ.log.
Traceback (most recent call last):
  File "/usr/local/bin/lilypond-book", line 2131, in <module>
    main ()
  File "/usr/local/bin/lilypond-book", line 2113, in main
    chunks = do_file (files[0])
  File "/usr/local/bin/lilypond-book", line 1986, in do_file
    set_default_options (source, default_ly_options, global_options.format)
  File "/usr/local/bin/lilypond-book", line 969, in set_default_options
    textwidth = get_latex_textwidth (source)
  File "/usr/local/bin/lilypond-book", line 1775, in get_latex_textwidth
    columns = int (m.group (1))
ValueError: invalid literal for int() with base 10: ''


Any ideas?

-- 
Francisco Vila. Badajoz (Spain)
www.paconet.org
www.csmbadajoz.com