I don't know what this Error means

Code:

[22:39:20] [Server thread/ERROR]: Could not pass event InventoryClickEvent to Vanilla v1.8
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot188.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot188.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_131]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_131]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot188.jar:git-Spigot-db6de12-18fbb24]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_131]
Caused by: java.lang.NullPointerException
    at org.bukkit.craftbukkit.v1_8_R3.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:176) ~[spigot188.jar:git-Spigot-db6de12-18fbb24]
    at ga.lgplay.vanilla.shop.ShopMain.onInventoryClick(ShopMain.java:73) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_131]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot188.jar:git-Spigot-db6de12-18fbb24]
    ... 15 more

 

the Inventory Class: https://hastebin.com/jesafoxeyi.vbs
ShopMain: https://hastebin.com/fufirujamu.java
Main: https://hastebin.com/wotejarizi.scala

 

this was Only is test the error comes by the other the Ores class

 

@lgplay You have the same error if u use the variable player for open the inventory ?

 

@Caderape2 yes same error

 

@lgplay If the error come when you open the empty inventory, i give up.
But if it comes when you open the inventory in the class Ores, it's cause the inventory has not been created, since you didn't call the constructor.

And don't abuse of static. You know how to use a constructor, use it well.

 

Thanks i forgot