convert-ly error?

[David Griffel]

I just installed 2.9.13 on WinXP after uninstalling 2.8.5

I tried to convert a .ly file, with first line
\version "2.8.5"

It failed. Here's the ouput from the console window.

====================================================================
C:\DOCUME~1\ALLUSE~1\DOCUME~1\_DAVID~1\LILY\CLAV-S~1>convert-ly -e 
geheimni.ly
Traceback (most recent call last):
  File "C:\PROGRA~1\LilyPond\usr\bin\convert-ly.py", line 39, in ?
    import lilylib as ly
SystemError: NULL result without error in PyObject_Call

C:\DOCUME~1\ALLUSE~1\DOCUME~1\_DAVID~1\LILY\CLAV-S~1>
====================================================================

My mistake, or a program bug?

David