Skript isn't working anymore for me

[Plaayxx]

Hello guys. I just bought a vserver and installed skript and made my skripts there.
then i became this error and the skript didn't work anymore
[17:39:09 ERROR]: #!#! and check whether this error has already been reported.
[17:39:09 ERROR]: #!#! If not please create a new ticket with a meaningful title, copy & paste this whole error into it,
[17:39:09 ERROR]: #!#! and describe what you did before it happened and/or what you think caused the error.
[17:39:09 ERROR]: #!#! If you think that it's a trigger that's causing the error please post the trigger as well.
[17:39:09 ERROR]: #!#! By following this guide fixing the error should be easy and done fast.
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! Stack trace:
[17:39:09 ERROR]: #!#! ch.njol.skript.SkriptAPIException: No class info found for worldborder
[17:39:09 ERROR]: #!#! at ch.njol.skript.registrations.Classes.getClassInfo(Classes.java:242)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.getExprInfo(SkriptParser.java:1247)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse_i(SkriptParser.java:969)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse(SkriptParser.java:209)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse(SkriptParser.java:164)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parseSingleExpr(SkriptParser.java:509)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parseObjectExpression(SkriptParser.java:380)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parseExpression(SkriptParser.java:286)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse_i(SkriptParser.java:990)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse_i(SkriptParser.java:981)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse(SkriptParser.java:209)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.SkriptParser.parse(SkriptParser.java:164)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.Statement.parse(Statement.java:42)
[17:39:09 ERROR]: #!#! at ch.njol.skript.ScriptLoader.loadItems(ScriptLoader.java:615)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.TriggerSection.<init>(TriggerSection.java:55)
[17:39:09 ERROR]: #!#! at ch.njol.skript.lang.Conditional.<init>(Conditional.java:44)
[17:39:09 ERROR]: #!#! at ch.njol.skript.ScriptLoader.loadItems(ScriptLoader.java:701)
[17:39:09 ERROR]: #!#! at ch.njol.skript.command.Commands.loadCommand(Commands.java:449)
[17:39:09 ERROR]: #!#! at ch.njol.skript.ScriptLoader.loadScript(ScriptLoader.java:462)
[17:39:09 ERROR]: #!#! at ch.njol.skript.ScriptLoader.loadScripts(ScriptLoader.java:262)
[17:39:09 ERROR]: #!#! at ch.njol.skript.SkriptCommand.onCommand(SkriptCommand.java:155)
[17:39:09 ERROR]: #!#! at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[17:39:09 ERROR]: #!#! at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140)
[17:39:09 ERROR]: #!#! at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:620)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1106)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:966)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:37)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(SourceFile:9)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
[17:39:09 ERROR]: #!#! at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[17:39:09 ERROR]: #!#! at java.util.concurrent.FutureTask.run(FutureTask.java:266)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:673)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629)
[17:39:09 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537)
[17:39:09 ERROR]: #!#! at java.lang.Thread.run(Thread.java:748)
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! Version Information:
[17:39:09 ERROR]: #!#! Skript: 2.1.2
[17:39:09 ERROR]: #!#! Bukkit: 1.8.8-R0.1-SNAPSHOT
[17:39:09 ERROR]: #!#! Minecraft: 1.8.8
[17:39:09 ERROR]: #!#! Java: 1.8.0_212
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! Running CraftBukkit: false
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! Current node: set {munition.pistole} to firework star named "&cMunition&8: &cPistole" (gun.sk, line 6)
[17:39:09 ERROR]: #!#! Current item: null
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! Thread: Server thread
[17:39:09 ERROR]: #!#!
[17:39:09 ERROR]: #!#! End of Error.
[17:39:09 ERROR]: #!#!

my version is craftbukkit 1.8.8
and my skript:
command /munition [<text>]:
aliases: m, mu
permission: *
trigger:
if arg 1 is "Pistole":
set {munition.pistole} to firework star named "&cMunition&8: &cPistole"
loop 64 times:
give player {munition.pistole}
play "NOTE_BASS" to player

on damage:
if attacker is holding {pistole}:
if projectile is a snowball:
damage victim by 1 hearts
on leftclick:
if player is holding {pistole}:
cancel event
command /pistole:
permission: test.pistole
permission message: &c!
trigger:
set {pistole} to diamond shovel named "&cPistole"
give player {pistole}

on right click:
if player is holding {pistole}:
cancel event
if player has {munition.pistole}:
if {pistole.cooldown.%player%} is true:
stop
if player is not sneaking:
set {pistole.cooldown.%player%} to true
remove {munition.pistole} from player's inventory
shoot a snowball at speed 2.25
play "ZOMBIE_WOOD" to player
wait 7.5 ticks
delete {pistole.cooldown.%player%}
stop
else:
set {pistole.cooldown.%player%} to true
remove {munition.pistole} from player's inventory
shoot a snowball at speed 2.25
play "ZOMBIE_WOOD" to player
wait 7.5 ticks
delete {pistole.cooldown.%player%}
push player 0.070 blocks backwards
stop
else:
send "&cDu hast keine Munition mehr!"
play "NOTE_BASS" to player
stop

on join:
delete {pistole.cooldown.%player%}