Bukkit

Every time i try to join i am teleported to a spawn point and locks me there nothing works, if I trey /ha quit or leave it says that I am not in a game and the only way to unblock me is to deactivate the arena, also when i join an „internal error occured” message appears and this is the console message

BLABLA03 issued server command: /hg join arena1BLABLA03 issued server command: /hg join arena1[13:25:05 ERROR]: nullorg.bukkit.command.CommandException: Unhandled exception executing command 'hg' in plugin MyHungerGames v1.1 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:723) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1658) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1498) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:918) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:911) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:895) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:828) [spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]Caused by: java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player; at me.kitskub.hungergames.utils.ChatUtils.broadcastRaw(ChatUtils.java:50) ~[?:?] at me.kitskub.hungergames.utils.ChatUtils.broadcast(ChatUtils.java:28) ~[?:?] at me.kitskub.hungergames.utils.ChatUtils.broadcast(ChatUtils.java:32) ~[?:?] at me.kitskub.hungergames.games.HungerGame.join(HungerGame.java:811) ~[?:?] at me.kitskub.hungergames.commands.user.JoinCommand.handlePlayer(JoinCommand.java:33) ~[?:?] at me.kitskub.hungergames.commands.PlayerCommand.handle(PlayerCommand.java:28) ~[?:?] at me.kitskub.hungergames.commands.Command.execute(Command.java:68) ~[?:?] at me.kitskub.hungergames.commands.CommandHandler.handleCommand(CommandHandler.java:40) ~[?:?] at me.kitskub.hungergames.commands.CommandHandler.onCommand(CommandHandler.java:22) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot-1.15.2.jar:git-Spigot-2f5d615-d07a78b] ... 17 more