I think the error would likely be this one in case of too many inflexions (and it would not be fatal as it is only a warning):
Quote:
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Warning(index build):W15001: inflection rule or rule group too long (max=255). Discarded.
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I have no idea about your original error yet (the same I hit too).
It is a shame that, in 2025, we have no alternative to kindlegen.