[11:37:24] [main/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:384) ~[fabric-loader-0.15.7.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.Hooks.startServer(Hooks.java:63) ~[fabric-loader-0.15.7.jar:?]
        at net.minecraft.server.Main.main(Main.java:112) ~[server-intermediary.jar:?]
        at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) ~[fabric-loader-0.15.7.jar:?]
        at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.15.7.jar:?]
        at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) ~[fabric-loader-0.15.7.jar:?]
        at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) ~[fabric-loader-0.15.7.jar:?]
        at net.fabricmc.installer.ServerLauncher.main(ServerLauncher.java:69) ~[fabric-server-mc.1.20.1-loader.0.15.7-launcher.1.0.0.jar:1.0.0]