[21:25:06] [Render thread/ERROR]: Failed to load book betternether:betternether_book defined by mod betternether, skipping
java.lang.IllegalArgumentException: Book betternether:betternether_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.
	at vazkii.patchouli.common.book.Book.<init>(Book.java:145) ~[Patchouli-1.20.1-84-FABRIC.jar:?]
	at vazkii.patchouli.common.book.BookRegistry.loadBook(BookRegistry.java:90) ~[Patchouli-1.20.1-84-FABRIC.jar:?]
	at vazkii.patchouli.common.book.BookRegistry.lambda$init$3(BookRegistry.java:75) ~[Patchouli-1.20.1-84-FABRIC.jar:?]
	at java.util.HashMap.forEach(HashMap.java:1421) ~[?:?]
	at vazkii.patchouli.common.book.BookRegistry.init(BookRegistry.java:70) ~[Patchouli-1.20.1-84-FABRIC.jar:?]
	at vazkii.patchouli.fabric.common.FabricModInitializer.onInitialize(FabricModInitializer.java:33) ~[Patchouli-1.20.1-84-FABRIC.jar:?]
	at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399) ~[fabric-loader-0.16.7.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52) ~[fabric-loader-0.16.7.jar:?]
	at net.minecraft.class_310.<init>(class_310.java:458) ~[client-intermediary.jar:?]
	at net.minecraft.client.main.Main.main(Main.java:211) ~[fabric-loader-0.16.7-1.20.1.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480) ~[fabric-loader-0.16.7.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.16.7.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.16.7.jar:?]