Forge loads the game normally, and so does my launcher, but when I try to create a new world, the game crashes. I look up the crash report to find out what went wrong and this came up.

java.lang.NoSuchMethodError: 'net.minecraft.nbt.CompoundTag com.stal111.valhelsia_structures.common.block.entity.JarBlockEntity.save(net.minecraft.nbt.CompoundTag)' at com.stal111.valhelsia_structures.common.block.entity.JarBlockEntity.m_5995_(JarBlockEntity.java:68) ~[valhelsia_structures-1.18.1-0.1.0.jar%23106!/:1.18.1-0.1.0] {re:classloading} at net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData$BlockEntityInfo.m_195691_(ClientboundLevelChunkPacketData.java:153) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.network.protocol.game.ClientboundLevelChunkPacketData.<init>(ClientboundLevelChunkPacketData.java:44) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket.<init>(ClientboundLevelChunkWithLightPacket.java:24) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.level.ChunkMap.m_183760_(ChunkMap.java:1459) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:A} at net.minecraft.server.level.ChunkMap.m_183754_(ChunkMap.java:1009) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:A} at net.minecraft.server.level.ChunkMap.m_140192_(ChunkMap.java:1195) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:A} at net.minecraft.server.level.ChunkMap.m_140199_(ChunkMap.java:1360) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:OptiFine:default,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:mixin:A} at net.minecraft.server.level.ServerChunkCache.m_8463_(ServerChunkCache.java:458) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.level.ServerLevel$EntityCallbacks.m_141985_(ServerLevel.java:1551) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.level.ServerLevel$EntityCallbacks.m_141985_(ServerLevel.java:1534) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157575_(PersistentEntitySectionManager.java:135) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.world.level.entity.PersistentEntitySectionManager.addEntityWithoutEvent(PersistentEntitySectionManager.java:98) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.world.level.entity.PersistentEntitySectionManager.addNewEntityWithoutEvent(PersistentEntitySectionManager.java:76) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.level.ServerLevel.m_8853_(ServerLevel.java:827) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:fml:sereneseasons:temperature_transformer,re:classloading,pl:accesstransformer:B,xf:fml:sereneseasons:temperature_transformer,pl:mixin:APP:blueprint.mixins.json:ServerLevelMixin,pl:mixin:A} at net.minecraft.server.level.ServerLevel.m_8834_(ServerLevel.java:771) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,xf:fml:sereneseasons:temperature_transformer,re:classloading,pl:accesstransformer:B,xf:fml:sereneseasons:temperature_transformer,pl:mixin:APP:blueprint.mixins.json:ServerLevelMixin,pl:mixin:A} at net.minecraft.server.players.PlayerList.m_11261_(PlayerList.java:190) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading,xf:fml:xaerominimap:xaero_playerlist_sendworldinfo,xf:fml:xaeroworldmap:xaero_wm_playerlist_sendworldinfo} at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_143699_(ServerLoginPacketListenerImpl.java:138) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_10055_(ServerLoginPacketListenerImpl.java:125) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_10050_(ServerLoginPacketListenerImpl.java:69) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.network.Connection.m_129483_(Connection.java:229) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading,re:mixin} at net.minecraft.server.network.ServerConnectionListener.m_9721_(ServerConnectionListener.java:142) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading} at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:882) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:808) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:120) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:classloading,xf:OptiFine:default} at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:668) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.m_177918_(MinecraftServer.java:258) ~[client-1.18.1-20211210.034407-srg.jar%23109!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at java.lang.Thread.run(Thread.java:833) [?:?] {}

Please fix it as soon as possible.

Thank you for your consideration, and stay safe!

The game crashed whilst exception in server tick loop
Error: java.lang.NoSuchMethodError: 'net.minecraft.nbt.CompoundTag com.stal111.valhelsia_structures.common.block.entity.JarBlockEntity.save(net.minecraft.nbt.CompoundTag)'
Exit Code: -1

Also getting a crash

Closing - duplicate of #119