Hi, Brian & Simon:
It seems that the \grace or \\acciaccatura is the code generate the error. I use window 10.
1). with \grace programming error spears
2). change \grace to \acciaccatura compiles clean without programming error
3). BUT input next bar (measure) the programming error appears.
4). Remove \grace or \\acciaccatura from my full .ly file, it compiles clean.
1.) what is the difference between \grace & \acciaccatura?
2.) How to resolve this programming error...?
3.) Just ignore it?