I've already tested everything and it worked fine. If this behavior continues with other users' plugins, i have no plans to support you.
Version: 2.2.8
AGAIN NOT WORKING
[10:12:20 INFO]: Kapsel693 issued server command: /gs joinmenu
[10:12:20 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'gs' in plugin GrinchSimulator v2.2.6
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.dispatchCommand(CraftServer.java:999) ~[paper-1.20.4.jar:git-Paper-499]
at org.bukkit.craftbukkit.v1_20_R3.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:64) ~[paper-1.20.4.jar:git-Paper-499]
at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.2.9.jar:?]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:31) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.commands.execution.CommandQueueEntry.a(CommandQueueEntry.java:5) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:103) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:434) ~[?:?]
at net.minecraft.commands.Commands.performCommand(Commands.java:336) ~[?:?]
at net.minecraft.commands.Commands.performCommand(Commands.java:323) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.performChatCommand(ServerGamePacketListenerImpl.java:2230) ~[?:?]
at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$14(ServerGamePacketListenerImpl.java:2190) ~[?:?]
at net.minecraft.util.thread.BlockableEventLoop.lambda$submitAsync$0(BlockableEventLoop.java:59) ~[?:?]
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:149) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1465) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:194) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:123) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1442) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1365) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:133) ~[?:?]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1343) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1232) ~[paper-1.20.4.jar:git-Paper-499]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319) ~[paper-1.20.4.jar:git-Paper-499]
at java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.IllegalArgumentException: Size for custom inventory must be a multiple of 9 between 9 and 54 slots (got 0)
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:191) ~[guava-32.1.2-jre.jar:?]
at org.bukkit.craftbukkit.v1_20_R3.CraftServer.createInventory(CraftServer.java:2402) ~[paper-1.20.4.jar:git-Paper-499]
at org.bukkit.Bukkit.createInventory(Bukkit.java:1895) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
at ro.fr33styler.grinchsimulator.gui.Gui.<init>(Gui.java:46) ~[GrinchSimulator-2.2.6.jar:?]
at ro.fr33styler.grinchsimulator.menu.GameJoinMenu.open(GameJoinMenu.java:17) ~[GrinchSimulator-2.2.6.jar:?]
at ro.fr33styler.grinchsimulator.commands.CommandJoinMenu.executeCommand(CommandJoinMenu.java:25) ~[GrinchSimulator-2.2.6.jar:?]
at ro.fr33styler.grinchsimulator.Commands.onCommand(Commands.java:53) ~[GrinchSimulator-2.2.6.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?]
... 29 more
[01:26:06 WARN]: Can't keep up! Is the server overloaded? Running 2550ms or 51 ticks behind
[01:26:26 WARN]: java.lang.IllegalStateException: zip file closed
[01:26:26 WARN]: at java.base/java.util.zip.ZipFile.ensureOpen(ZipFile.java:840)
[01:26:26 WARN]: at java.base/java.util.zip.ZipFile.getEntry(ZipFile.java:339)
[01:26:26 WARN]: at java.base/java.util.jar.JarFile.getEntry(JarFile.java:517)
[01:26:26 WARN]: at java.base/java.util.jar.JarFile.getJarEntry(JarFile.java:472)
[01:26:26 WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:209)
[01:26:26 WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
[01:26:26 WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:169)
[01:26:26 WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:164)
[01:26:26 WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
[01:26:26 WARN]: at GrinchSimulator-1.8.jar//ro.fr33styler.grinchsimulator.handler.Game.run(Game.java:302)
[01:26:26 WARN]: at GrinchSimulator-1.8.jar//ro.fr33styler.grinchsimulator.UpdateTask.run(UpdateTask.java:64)
[01:26:26 WARN]: at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftTask.run(CraftTask.java:101)
[01:26:26 WARN]: at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:482)
[01:26:27 WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1646)
[01:26:27 WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:447)
[01:26:27 WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1525)
[01:26:27 WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1226)
[01:26:27 WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:319)
[01:26:27 WARN]: at java.base/java.lang.Thread.run(Thread.java:840)
Plugin has been totally brake in the last version to this step that when there is countdown to the start and its 0 - players has been teleported to the main spawn