I uninstall v2.19.12 and install v19.13 and run a lily file and I got the following error. I then run convert-ly; re-run and got the same error.
The .ly file run without error in v2.19.12.
Emmanuel,
Ming.
Starting lilypond-windows.exe 2.19.13 [joyful-joyful-we-adore-thee.ly]...
Processing `C:/Users/Tsang/Dropbox/Lyndon/HYMN/CP_002/joyful-joyful-we-adore-thee.ly'
Parsing...
Interpreting music...
Interpreting music...
Interpreting music...
Interpreting music...
Exited with return code 1.