`java.lang.Exception: Mod Loading has failed
at net.minecraftforge.logging.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:69) ~[forge-1.18.1-39.0.63-universal.jar%23114!/:?] {re:classloading}
at net.minecraftforge.client.loading.ClientModLoader.completeModLoading(ClientModLoader.java:183) ~[forge-1.18.1-39.0.63-universal.jar%23114!/:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$new$1(Minecraft.java:553) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.Util.m_137521_(Util.java:569) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:classloading,xf:OptiFine:default,re:mixin,xf:OptiFine:default}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:547) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.screens.LoadingOverlay.m_6305_(LoadingOverlay.java:196) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:1254) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1040) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:660) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:205) ~[client-1.18.1-20211210.034407-srg.jar%23110!/:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:45) ~[fmlloader-1.18.1-39.0.63.jar%2323!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) [modlauncher-9.1.0.jar%235!/:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149) [bootstraplauncher-1.0.0.jar:?] {}

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at com.stal111.valhelsia_structures.common.block.DungeonDoorBlock.(DungeonDoorBlock.java:67) ~[valhelsia_structures-1.18.1-0.1.1.jar%23107!/:1.18.1-0.1.1] {re:classloading}
-- MOD valhelsia_structures --
Details:
Mod File: valhelsia_structures-1.18.1-0.1.1.jar
Failure message: Valhelsia Structures (valhelsia_structures) has failed to load correctly
java.lang.NoSuchMethodError: 'java.util.Map net.valhelsia.valhelsia_core.common.helper.VoxelShapeHelper.getHorizontalRotatedShapes(net.minecraft.world.phys.shapes.VoxelShape)'
Mod Version: 1.18.1-0.1.1
Mod Issue URL: https://github.com/ValhelsiaTeam/Valhelsia-Structures/issues
Exception message: java.lang.NoSuchMethodError: 'java.util.Map net.valhelsia.valhelsia_core.common.helper.VoxelShapeHelper.getHorizontalRotatedShapes(net.minecraft.world.phys.shapes.VoxelShape)'
Stacktrace:
at com.stal111.valhelsia_structures.common.block.DungeonDoorBlock.(DungeonDoorBlock.java:67) ~[valhelsia_structures-1.18.1-0.1.1.jar%23107!/:1.18.1-0.1.1] {re:classloading}
at com.stal111.valhelsia_structures.core.init.ModBlocks.(ModBlocks.java:89) ~[valhelsia_structures-1.18.1-0.1.1.jar%23107!/:1.18.1-0.1.1] {re:mixin,re:classloading}
at java.lang.Class.forName0(Native Method) ~[?:?] {re:mixin}
at java.lang.Class.forName(Class.java:467) ~[?:?] {re:mixin}
at net.minecraftforge.fml.javafmlmod.AutomaticEventSubscriber.lambda$inject$6(AutomaticEventSubscriber.java:75) ~[javafmllanguage-1.18.1-39.0.63.jar%23112!/:?] {}
at java.util.ArrayList.forEach(ArrayList.java:1511) ~[?:?] {re:mixin}
at net.minecraftforge.fml.javafmlmod.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:62) ~[javafmllanguage-1.18.1-39.0.63.jar%23112!/:?] {}
at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:91) ~[javafmllanguage-1.18.1-39.0.63.jar%23112!/:?] {}
at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[fmlcore-1.18.1-39.0.63.jar%23111!/:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804) ~[?:?] {}
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796) ~[?:?] {}
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {re:computing_frames}
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {re:computing_frames}
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}
`

You are either missing or have an older version of Valhelsia Core. You need the latest version of that, too.