java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'boatcontainer'!
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.lambda$invoke0$0(EntrypointUtils.java:51)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:49)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke(EntrypointUtils.java:35)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
at net.minecraft.class_310.(class_310.java:443)
at net.minecraft.client.main.Main.main(Main.java:198)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Suppressed: java.lang.NoClassDefFoundError: website/skylorbeck/minecraft/skylorlib/MidnightConfig
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(Unknown Source)
at java.base/java.security.SecureClassLoader.defineClass(Unknown Source)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:186)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:347)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:145)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at website.skylorbeck.minecraft.difficultyplus.Difficultyplus.onInitialize(Difficultyplus.java:15)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47)
... 7 more
Caused by: java.lang.ClassNotFoundException: website.skylorbeck.minecraft.skylorlib.MidnightConfig
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:226)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:145)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
Caused by: java.lang.ExceptionInInitializerError
at de.kxmischesdomi.boatcontainer.BoatContainer.onInitialize(BoatContainer.java:13)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47)
... 7 more
Caused by: net.minecraft.class_151: Non [a-z0-9/._-] character in path of location: boatcontainer:twigs:stripped_bamboo_chest_boat
at net.minecraft.class_2960.(class_2960.java:41)
at net.minecraft.class_2960.(class_2960.java:50)
at de.kxmischesdomi.boatcontainer.common.registry.ModItems.register(ModItems.java:65)
at de.kxmischesdomi.boatcontainer.common.registry.ModItems.registerBoat(ModItems.java:56)
at de.kxmischesdomi.boatcontainer.common.registry.ModItems.(ModItems.java:37)
... 9 more

Tested along with Better Minecraft Fabric v1.19 Modpack.

Seems like twigs messed something up in the 1.19 update. Don't know what it is and don't got time to look into that deeper.
Added a catch that the mod won't crash in the newest version.

Fixed in the newest update