Error message

[Manuel]

Whenever I work with somewhat large files, LilyPond takes either an  
extremely long time to compile or just stops working. The last time  
it happened, a new window opened with this information:

(error: NSInternalInconsistencyException - Error (1000) creating  
CGSWindow)
See the Console for a detailed traceback.

In the Console, I found:

  File "/Applications/LilyPond.app/Contents/Resources/__boot__.py",  
line 28, in ?
    _run('LilyPond.py')
  File "/Applications/LilyPond.app/Contents/Resources/__boot__.py",  
line 25, in _run
    execfile(os.path.join(base, 'Python', script), globals(), globals 
())
  File "/Applications/LilyPond.app/Contents/Resources/Python/ 
LilyPond.py", line 214, in ?
    AppHelper.runEventLoop()
  File "PyObjCTools/AppHelper.pyc", line 174, in runEventLoop
objc.error: NSInternalInconsistencyException - Error (1000) creating  
CGSWindow
2007-01-21 23:19:33.328 LilyPond[286] LilyPond Error
2007-01-21 23:19:33.329 LilyPond[286] An unexpected error has  
occurred during execution of the main script


I divided the file into smaller portions and it works perfectly, but  
I don't understand why I have so much trouble otherwise. Is it a  
mistake in my input?

Manuel