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customUI errors #1041
the warning seems bogus as you can find recent docs with that reference, e.g.: https://docs.microsoft.com/en-us/openspecs/office_standards/ms-customui/d842006e-3187-4f66-a17d-0819a3cc94b5
However, I think I fixed that error you saw, will release shortly, let me know if that doesn't resolve it.