Solved error

[dansktopgaming]

i get this error
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! [Skript] Severe Error:
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! If you're developing an add-on for Skript this likely means that you have done something wrong.
> [16:02:01 ERROR]: #!#! If you're a server admin however please go to https://github.com/bensku/Skript/issues/
> [16:02:01 ERROR]: #!#! and check whether this error has already been reported.
> [16:02:01 ERROR]: #!#! If not please create a new ticket with a meaningful title, copy & paste this whole error into it (or use paste service),
> [16:02:01 ERROR]: #!#! and describe what you did before it happened and/or what you think caused the error.
> [16:02:01 ERROR]: #!#! If you think that it's a trigger that's causing the error please post the trigger as well.
> [16:02:01 ERROR]: #!#! By following this guide fixing the error should be easy and done fast.
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! Stack trace:
> [16:02:01 ERROR]: #!#! java.lang.NullPointerException
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.expressions.gui.ExprVirtualInv.get(ExprVirtualInv.java:80)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.expressions.gui.ExprVirtualInv.get(ExprVirtualInv.java:23)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.util.SimpleExpression.getArray(SimpleExpression.java:105)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.util.SimpleExpression.getSingle(SimpleExpression.java:63)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.effects.EffOpenInventory.execute(EffOpenInventory.java:98)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.Effect.run(Effect.java:54)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:65)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:93)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.Trigger.execute(Trigger.java:53)
> [16:02:01 ERROR]: #!#! at com.btk5h.skriptmirror.skript.custom.effect.CustomEffect.invokeEffect(CustomEffect.java:45)
> [16:02:01 ERROR]: #!#! at com.btk5h.skriptmirror.skript.custom.effect.CustomEffect.walk(CustomEffect.java:28)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:93)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.util.EffectSection.runSection(EffectSection.java:135)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.sections.gui.EffFormatGUI.lambda$execute$1(EffFormatGUI.java:146)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.manager.gui.GUI.run(GUI.java:31)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.manager.gui.GUIManager$1.onClick(GUIManager.java:149)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.listeners.GUIListener.onEvent(GUIListener.java:57)
> [16:02:01 ERROR]: #!#! at com.github.tukenuke.tuske.manager.gui.v2.SkriptGUIEvent.check(SkriptGUIEvent.java:39)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.SkriptEventHandler.check(SkriptEventHandler.java:149)
> [16:02:01 ERROR]: #!#! at ch.njol.skript.SkriptEventHandler$1.execute(SkriptEventHandler.java:112)
> [16:02:01 ERROR]: #!#! at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
> [16:02:01 ERROR]: #!#! at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
> [16:02:01 ERROR]: #!#! at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
> [16:02:01 ERROR]: #!#! at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [16:02:01 ERROR]: #!#! at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
> [16:02:01 ERROR]: #!#! at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
> [16:02:01 ERROR]: #!#! at java.lang.Thread.run(Thread.java:748)
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! Version Information:
> [16:02:01 ERROR]: #!#! Skript: 2.2-dev25
> [16:02:01 ERROR]: #!#! Bukkit: 1.8.8-R0.1-SNAPSHOT
> [16:02:01 ERROR]: #!#! Minecraft: 1.8.8
> [16:02:01 ERROR]: #!#! Java: 1.8.0_262 (OpenJDK 64-Bit Server VM 25.262-b10)
> [16:02:01 ERROR]: #!#! OS: Linux amd64 4.15.0-108-generic
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! Running CraftBukkit: false
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! Current node: null
> [16:02:01 ERROR]: #!#! Current item: open virtual inventory to {_player}(as org.bukkit.entity.Player)
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! Thread: Server thread
> [16:02:01 ERROR]: #!#!
> [16:02:01 ERROR]: #!#! End of Error.
> [16:02:01 ERROR]: #!#!

effect:
    patterns:
        open buy menu %player% %text%
    trigger:
        set {_player} to expression-1
        set {_yaml} to expression-2
        broadcast "%{_yaml}%"
        open virtual chest inventory with size {BUY::GUI::%{_yaml}%::MENUSIZE} named "%{BUY::GUI::%{_yaml}%::MENUNAME}%" to {_player}
        if {BUY::GUI::%{_yaml}%::MENUSIZE} is 1:
            set {_n} to 0
            loop 9 times:
                format gui slot {_n} of {_player} with {BUY::GUI::%{_yaml}%::FILLITEM} named " "
                add 1 to {_n}
        else if {BUY::GUI::%{_yaml}%::MENUSIZE} is 2:
            set {_n} to 0
            loop 18 times:
                format gui slot {_n} of {_player} with {BUY::GUI::%{_yaml}%::FILLITEM} named " "
                add 1 to {_n}
        else if {BUY::GUI::%{_yaml}%::MENUSIZE} is 3:
            set {_n} to 0
            loop 27 times:
                format gui slot {_n} of {_player} with {BUY::GUI::%{_yaml}%::FILLITEM} named " "
                add 1 to {_n}
        else if {BUY::GUI::%{_yaml}%::MENUSIZE} is 4:
            set {_n} to 0
            loop 36 times:
                format gui slot {_n} of {_player} with {BUY::GUI::%{_yaml}%::FILLITEM} named " "
                add 1 to {_n}
        else if {BUY::GUI::%{_yaml}%::MENUSIZE} is 5:
            set {_n} to 0
            loop 45 times:
                format gui slot {_n} of {_player} with {BUY::GUI::%{_yaml}%::FILLITEM} named " "
                add 1 to {_n}
        loop {BUY::GUI::%{_yaml}%::SLOT::*}:
            set {_slot} to "%loop-value%" parsed as a number 
            set {_item} to "%{BUY::GUI::%{_yaml}%::%loop-value%::item}%" parsed as a item
            if "%{BUY::GUI::%{_yaml}%::%loop-value%::action}%" is "change menu":
                replace all " " with "" in {color::%loop-value%}
                #set {_lore} to placeholder change "%{BUY::GUI::%{_yaml}%::%loop-value%::lore}%" {_player} "%{color::%loop-value%}%"
                format gui slot {_slot} of {_player} with {_item} named "%{BUY::GUI::%{_yaml}%::%loop-value%::name}%" with lore "%{_lore}%" to run:
                    open buy menu {_player} "%{BUY::GUI::%{_yaml}%::%gui-slot%::nextmenu}%"