Problem/Bug SkyWarsReloaded Error

Hello, I have a problem with the SkyWarsReloaded plugin and it is that I have a SkyWars server, that when I open it from my PC, it works completely, but now that I've uploaded it to a host, when I enter an arena and click on the kits item, nothing appears to me. And when I do it writing "/ swr kit" I get "Internal error ...". The following appears on the console:

Code:

[17:32:01] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to SkyWarsReloaded v2.8.4
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:227) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:463) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:759) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_91]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [spigot.jar:git-Spigot-fdc1440-53fac9f]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.NullPointerException
at java.util.LinkedList.addAll(LinkedList.java:408) ~[?:1.8.0_91]
at java.util.LinkedList.addAll(LinkedList.java:387) ~[?:1.8.0_91]
at com.walrusone.skywars.menus.KitMenu.<init>(KitMenu.java:116) ~[?:?]
at com.walrusone.skywars.listeners.PlayerListener.onPlayerInteract(PlayerListener.java:249) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_91]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-fdc1440-53fac9f]
... 17 more

Im using Spigot 1.8.8 and SkyWarsReloaded v2.8.4

I know it's not the latest version, but if I update it, nothing works for me anymore.

 

https://pastebin.com/6gCDPs8q