convert-ly error in 2.7.32 Windows

[Thomas Scharkowski]

I get the following error message (LilyPond 2.7.32, Windwos XP):
--
Traceback (most recent call last):
  File "C:\Programme\LilyPond\usr\bin\convert-ly.py", line 271, in ?
    main ()
  File "C:\Programme\LilyPond\usr\bin\convert-ly.py", line 265, in 
main
    do_one_file (f)
  File "C:\Programme\LilyPond\usr\bin\convert-ly.py", line 151, in 
do_one_file
    guess = guess_lilypond_version (infile_name)
  File "C:\Programme\LilyPond\usr\bin\convert-ly.py", line 129, in 
guess_lilypond_version
    return m.group (1)
IndexError: no such group
Process convert-ly.py exited with code 1
--

2.7.31-2 worked.

Greetings,
Thomas