В таких случаях смотрят на ошибку в консоли. Без неё так ни чё не сказать.
[12:12:55] [Server thread/ERROR] [net.minecraft.network.NetHandlerPlayServer]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'case' in plugin CaseQ v2.1
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[PluginCommand.class:ad7ca54-STABLE]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:153) ~[SimpleCommandMap.class:ad7ca54-STABLE]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:689) ~[CraftServer.class:ad7ca54-STABLE]
at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:1604) ~[pa.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:1452) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(CPacketChatMessage.java:50) ~[la.class:?]
at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(CPacketChatMessage.java:11) ~[la.class:?]
at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:14) ~[hv.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_292]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_292]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:926) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:461) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:865) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:737) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
Caused by: java.lang.NullPointerException
at mw.TravoQur.caseq.Main.onCommand(Main.java:77) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[PluginCommand.class:ad7ca54-STABLE]
... 15 more
Вот ошибка из консоли
