[17:40:04 ERROR]: Could not pass event InventoryClickEvent to AdvancementGUI v1.
0.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:306) ~[spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:499) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:484) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.jav
a:1877) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33
) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10
) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:
13) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.8.0_51]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_51]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot-1.
12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:
747) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:
405) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:
678) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.jav
a:576) [spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_51]
Caused by: java.lang.IllegalArgumentException: advancement
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java
:122) ~[spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        at org.bukkit.craftbukkit.v1_12_R1.entity.CraftPlayer.getAdvancementProg
ress(CraftPlayer.java:1449) ~[spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6
ba67-f7d14f1]
        at com.SamB440.AdvancementGUI.AdvancementAPI.grant(AdvancementAPI.java:3
44) ~[?:?]
        at com.SamB440.AdvancementGUI.InventoryManager.createAdvancement(Invento
ryManager.java:456) ~[?:?]
        at com.SamB440.AdvancementGUI.InventoryManager.onInventoryClick(Inventor
yManager.java:374) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
_51]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0
_51]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_51]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:302) ~[spigot-1.12-R0.1-SNAPSHOT-b1316.jar:git-Spigot-cd6ba67-f7d14f1]
        ... 15 more