[16:20:41] [Server thread/ERROR]: [ItemsAdder] Unhandled exception occurred in onPacketSending(PacketEvent) for ItemsAdder
com.comphenix.protocol.reflect.FieldAccessException: Field index 2 is out of bounds for length 1
at com.comphenix.protocol.reflect.FieldAccessException.fromFormat(FieldAccessException.java:49) ~[?:?]
at com.comphenix.protocol.reflect.StructureModifier.read(StructureModifier.java:247) ~[?:?]
at ia.m.hG.onPacketSending(SourceFile:183) ~[?:?]
at com.comphenix.protocol.injector.collection.OutboundPacketListenerSet.invokeListener(OutboundPacketListenerSet.java:74) ~[?:?]
at com.comphenix.protocol.injector.collection.PacketListenerSet.lambda$invoke$0(PacketListenerSet.java:123) ~[?:?]
at com.comphenix.protocol.timing.TimingTracker.lambda$static$0(TimingTracker.java:7) ~[?:?]
at com.comphenix.protocol.injector.collection.PacketListenerSet.invoke(PacketListenerSet.java:123) ~[?:?]
at com.comphenix.protocol.injector.collection.OutboundPacketListenerSet.invoke(OutboundPacketListenerSet.java:30) ~[?:?]
at com.comphenix.protocol.injector.collection.PacketListenerSet.invoke(PacketListenerSet.java:102) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.postPacketToListeners(PacketFilterManager.java:528) ~[?:?]
at com.comphenix.protocol.injector.PacketFilterManager.invokeOutboundPacketListeners(PacketFilterManager.java:516) ~[?:?]
at com.comphenix.protocol.injector.netty.channel.NettyChannelInjector.processOutbound(NettyChannelInjector.java:528) ~[?:?]
at com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.proxyRunnable(NettyEventLoopProxy.java:44) ~[?:?]
at com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.execute(NettyEventLoopProxy.java:233) ~[?:?]
at net.minecraft.network.NetworkManager.b(NetworkManager.java:303) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.network.NetworkManager.a(NetworkManager.java:279) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.ServerCommonPacketListenerImpl.a(ServerCommonPacketListenerImpl.java:206) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.ServerCommonPacketListenerImpl.b(ServerCommonPacketListenerImpl.java:191) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at org.bukkit.craftbukkit.v1_20_R3.entity.CraftHumanEntity.openCustomInventory(CraftHumanEntity.java:329) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at org.bukkit.craftbukkit.v1_20_R3.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:309) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at com.koken.gacha.gui.core.BaseGUI.open(BaseGUI.java:42) ~[?:?]
at com.koken.gacha.command.KokenCommand.openMainMenu(KokenCommand.java:116) ~[?:?]
at com.koken.gacha.command.KokenCommand.onCommand(KokenCommand.java:44) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchCommand(CraftServer.java:887) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at org.bukkit.craftbukkit.v1_20_R3.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:50) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.2.9.jar:?]
at net.minecraft.commands.execution.tasks.ExecuteCommand.a(SourceFile:29) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(SourceFile:13) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.execution.UnboundEntryAction.a(SourceFile:8) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.execution.CommandQueueEntry.a(SourceFile:8) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.execution.ExecutionContext.a(SourceFile:107) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.CommandDispatcher.a(CommandDispatcher.java:413) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.CommandDispatcher.performCommand(CommandDispatcher.java:335) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.commands.CommandDispatcher.a(CommandDispatcher.java:322) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1856) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.network.PlayerConnection.lambda$15(PlayerConnection.java:1818) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.util.thread.IAsyncTaskHandler.b(SourceFile:67) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
at net.minecraft.server.TickTask.run(SourceFile:18) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.util.thread.IAsyncTaskHandler.d(SourceFile:156) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.util.thread.IAsyncTaskHandlerReentrant.d(SourceFile:23) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1191) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:1) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.util.thread.IAsyncTaskHandler.x(SourceFile:130) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.bl(MinecraftServer.java:1170) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1163) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.util.thread.IAsyncTaskHandler.c(SourceFile:139) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.w_(MinecraftServer.java:1147) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1060) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:304) ~[spigot-1.20.4-R0.1-SNAPSHOT.jar:4090-Spigot-b754dcc-38b1f49]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
[16:20:41] [Server thread/ERROR]: Parameters:
net.minecraft.network.protocol.game.PacketPlayOutOpenWindow@4b539fba[
a=3
b=net.minecraft.world.inventory.Containers@4273cb4
c=empty[siblings=[literal{[}[style={color=dark_gray,!bold,!italic,!underlined,!strikethrough,!obfuscated}], literal{K├Âken}[style={color=gold,!bold,!italic,!underlined,!strikethrough,!obfuscated}], literal{] }[style={color=dark_gray,!bold,!italic,!underlined,!strikethrough,!obfuscated}], literal{Ana Men├╝}[style={color=gold,!bold,!italic,!underlined,!strikethrough,!obfuscated}]]]
]

3.6.6 Legacy 1.20.4