1.16 on right click doesn't work?

[dorazimuchim]

[Skript] Severe Error:
[03:17:59 ERROR]: #!#!
[03:17:59 ERROR]: #!#! Something went horribly wrong with Skript.
[03:17:59 ERROR]: #!#! This issue is NOT your fault! You probably can't fix it yourself, either.
[03:17:59 ERROR]: #!#! It looks like you are using some plugin(s) that alter how Skript works (addons).
[03:17:59 ERROR]: #!#! Here is full list of them:
[03:17:59 ERROR]: #!#! skRayFall v1.9.20 (https://sk.rayfall.net/) SkBee v1.4.2 (https://github.com/ShaneBeee/SkBee) skUtilities v0.9.2 (https://tim740.github.io/) Skellett v1.9.9 (https://forums.skunity.com/resources/skellett.24/) SkQuery v3.6.5
[03:17:59 ERROR]: #!#! We could not identify which of those are specially related, so this might also be Skript issue.
[03:17:59 ERROR]: #!#! You should try disabling those plugins one by one, trying to find which one causes it.
[03:17:59 ERROR]: #!#! If the error doesn't disappear even after disabling all listed plugins, it is probably Skript issue.
[03:17:59 ERROR]: #!#! In that case, you will be given instruction on how should you report it.
[03:17:59 ERROR]: #!#! On the other hand, if the error disappears when disabling some plugin, report it to author of that plugin.
[03:17:59 ERROR]: #!#! Only if the author tells you to do so, report it to Skript's issue tracker.
[03:17:59 ERROR]: #!#!
[03:17:59 ERROR]: #!#! Stack trace:
[03:17:59 ERROR]: #!#! java.lang.NullPointerException
[03:17:59 ERROR]: #!#! at ch.njol.skript.bukkitutil.ItemUtils.itemStacksEqual(ItemUtils.java:142)
[03:17:59 ERROR]: #!#! at ch.njol.skript.classes.data.SkriptClasses$16.change(SkriptClasses.java:622)
[03:17:59 ERROR]: #!#! at ch.njol.skript.classes.data.SkriptClasses$16.change(SkriptClasses.java:1)
[03:17:59 ERROR]: #!#! at ch.njol.skript.lang.util.SimpleExpression.change(SimpleExpression.java:243)
[03:17:59 ERROR]: #!#! at ch.njol.skript.effects.EffChange.execute(EffChange.java:284)
[03:17:59 ERROR]: #!#! at ch.njol.skript.lang.Effect.run(Effect.java:52)
[03:17:59 ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:61)
[03:17:59 ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:89)
[03:17:59 ERROR]: #!#! at ch.njol.skript.lang.Trigger.execute(Trigger.java:57)
[03:17:59 ERROR]: #!#! at ch.njol.skript.SkriptEventHandler.check(SkriptEventHandler.java:156)
[03:17:59 ERROR]: #!#! at ch.njol.skript.SkriptEventHandler$1.execute(SkriptEventHandler.java:114)
[03:17:59 ERROR]: #!#! at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80)
[03:17:59 ERROR]: #!#! at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70)
[03:17:59 ERROR]: #!#! at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607)
[03:17:59 ERROR]: #!#! at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:497)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.PlayerInteractManager.a(PlayerInteractManager.java:459)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.PlayerConnection.a(PlayerConnection.java:1449)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:27)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:5)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:23)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.TickTask.run(SourceFile:18)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.MinecraftServer.aZ(MinecraftServer.java:1136)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.MinecraftServer.executeNext(MinecraftServer.java:1129)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.MinecraftServer.sleepForTick(MinecraftServer.java:1090)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:1004)
[03:17:59 ERROR]: #!#! at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$a$0(MinecraftServer.java:177)
[03:17:59 ERROR]: #!#! at java.lang.Thread.run(Unknown Source)
[03:17:59 ERROR]: #!#!
[03:17:59 ERROR]: #!#! Version Information:
[03:17:59 ERROR]: #!#! Skript: 2.5-alpha5 (latest)
[03:17:59 ERROR]: #!#! Flavor: skriptlang-github
[03:17:59 ERROR]: #!#! Date: 2020-07-02
[03:17:59 ERROR]: #!#! Bukkit: 1.16.1-R0.1-SNAPSHOT
[03:17:59 ERROR]: #!#! Minecraft: 1.16.1
[03:17:59 ERROR]: #!#!


I've done for version-up my server yesterday, and found some problem in on right click on sign skript

code:
on right click:
if line 1 of block is "&6[test]":
message "%{_unix-time}%"

does anyone know what is the problem?