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[15:55:51] [Server thread/INFO]: CloverSO issued server command: /sk reload sk1
[15:55:52] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'sk' in plugin Skript v2.1.2
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_25]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_25]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.lang.NoSuchMethodError: ch.njol.util.NonNullPair.getSecond()Ljava/lang/Object;
    at ch.njol.skript.command.Commands.loadCommand(Commands.java:379) ~[?:?]
    at ch.njol.skript.ScriptLoader.loadScript(ScriptLoader.java:462) ~[?:?]
    at ch.njol.skript.ScriptLoader.loadScripts(ScriptLoader.java:262) ~[?:?]
    at ch.njol.skript.SkriptCommand.onCommand(SkriptCommand.java:155) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    ... 15 more
[15:56:33] [Server thread/INFO]: CloverSO issued server command: /sk reload sk1
[15:56:33] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'sk' in plugin Skript v2.1.2
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_25]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_25]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_25]
Caused by: java.lang.NoSuchMethodError: ch.njol.util.NonNullPair.getSecond()Ljava/lang/Object;
    at ch.njol.skript.command.Commands.loadCommand(Commands.java:379) ~[?:?]
    at ch.njol.skript.ScriptLoader.loadScript(ScriptLoader.java:462) ~[?:?]
    at ch.njol.skript.ScriptLoader.loadScripts(ScriptLoader.java:262) ~[?:?]
    at ch.njol.skript.SkriptCommand.onCommand(SkriptCommand.java:155) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot_serverMT.jar:git-Spigot-db6de12-18fbb24]
    ... 15 more
[15:57:01] [Server thread/INFO]: CloverSO lost connection: Internal Exception: java.io.IOException: Istniejące połączenie zostało gwałtownie zamknięte przez zdalnego hosta
[15:57:01] [Server thread/INFO]: CloverSO left the game.

Mówiłem o kodzie skryptu jak nie chcesz udst to napisz na PW

kod skryptu jest podstawowy czyli czyszczenie czatu itp, normalnie działało lecz przypadkowo usunełem folder skrypt a potem go wgrałem