So far I have not been able to reconstruct the exact error message, but I have encountered a problem in connection with the change of staves.
I do not understand:
why do the notes in the lower staff not stay in the lower staff?
Why is the first chord in the upper staff not displayed with the stem up?
Here is my code example:

Name your voices, e.g. by adding '= "r"' and '= "l"' respectively.
Or use \new Voice instead of \context Voice.
The way you do it now you are using the same voice for both Staffs and that's not what you mean.

HTH,
Michael
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 Michael Gerdau       email: m...@qata.de
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