I think it's to do with the grace notes.  There's no error in 2.19.2, so you 
may want to adopt the development version if you want to avoid the issue being 
flagged.

--
Phil Holmes


  ----- Original Message ----- 
  From: Knute Snortum 
  To: lilypond-user@gnu.org 
  Sent: Friday, May 09, 2014 5:35 PM
  Subject: MIDI error compiling source


  The attached LilyPond file producing "programming errors" below.  I've pared 
down the source so that it's smaller but still emits a warning.  Anyone know 
why the warnings are produced?  The PDF and MIDI files seem fine.  It's just 
that I don't like producing error messages.


  Starting lilypond-windows.exe 2.18.2 [midi_error_test.ly]...

  Processing `.../midi_error_test.ly'

  Parsing...

  Interpreting music...

  Preprocessing graphical objects...

  Interpreting music...

  MIDI output to `midi_error_test.mid'...

  programming error: Going back in MIDI time.

  continuing, cross fingers

  programming error: Going back in MIDI time.

  continuing, cross fingers

  programming error: Going back in MIDI time.

  continuing, cross fingers

  Finding the ideal number of pages...

  Fitting music on 1 page...

  Drawing systems...

  Layout output to `midi_error_test.ps'...

  Converting to `./midi_error_test.pdf'...

  Success: compilation successfully completed


  Completed successfully in 2.7".



  Knute Snortum
  (via Gmail)


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