Failed to load book simpleplanes:planes_book defined by mod simpleplanes, skipping
java.lang.IllegalArgumentException: Book simpleplanes:planes_book has use_resource_pack set to false. This behaviour was removed in 1.20. The book author should enable this flag and move all book contents clientside to /assets/, leaving the book.json in /data/. See https://vazkiimods.github.io/Patchouli/docs/upgrading/upgrade-guide-120 for details
Failed to load book simpleplanes:planes_book defined by mod simpleplanes, skipping java.lang.IllegalArgumentException: Book simpleplanes:planes_book has use_resource_pack set to false. This behaviour was removed in 1.20. The book author should enable this flag and move all book contents clientside to /assets/, leaving the book.json in /data/. See https://vazkiimods.github.io/Patchouli/docs/upgrading/upgrade-guide-120 for details