> [13:54:51 ERROR]: Could not pass event PlayerGameModeChangeEvent to PerWorldInve
> ntory v1.10.0
> org.bukkit.event.EventException
> at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
> va:310) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
> at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
> a:62) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
> at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
> ava:502) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
> ava:487) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.setGameMode(CraftPl
> ayer.java:753) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.EntityPlayer.a(EntityPlayer.java:943) [s
> pigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.CommandGamemode.execute(CommandGamemode.
> java:28) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at org.bukkit.craftbukkit.v1_8_R3.command.VanillaCommandWrapper.dispatch
> VanillaCommand(VanillaCommandWrapper.java:108) [spigot.jar:git-Spigot-21fe707-e1
> ebe52]
> at net.minecraft.server.v1_8_R3.CommandBlockListenerAbstract.executeComm
> and(CommandBlockListenerAbstract.java:165) [spigot.jar:git-Spigot-21fe707-e1ebe5
> 2]
> at net.minecraft.server.v1_8_R3.CommandBlockListenerAbstract.a(CommandBl
> ockListenerAbstract.java:92) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.BlockCommand.b(BlockCommand.java:48) [sp
> igot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.WorldServer.a(WorldServer.java:653) [spi
> got.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:249)
> [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
> 70) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
> 74) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
> 54) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
> :557) [spigot.jar:git-Spigot-21fe707-e1ebe52]
> at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
> Caused by: java.lang.NoClassDefFoundError: org/bukkit/attribute/Attribute
> at me.gnat008.perworldinventory.data.players.PWIPlayer.<init>(PWIPlayer.
> java:94) ~[?:?]
> at me.gnat008.perworldinventory.data.players.PWIPlayerFactory.create(PWI
> PlayerFactory.java:37) ~[?:?]
> at me.gnat008.perworldinventory.data.players.PWIPlayerManager.addPlayer(
> PWIPlayerManager.java:118) ~[?:?]
> at me.gnat008.perworldinventory.listeners.player.PlayerGameModeChangeLis
> tener.onPlayerGameModeChange(PlayerGameModeChangeListener.java:62) ~[?:?]
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0
> _121]
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
> java:62) ~[?:1.8.0_121]
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
> sorImpl.java:43) ~[?:1.8.0_121]
> at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_121]
> at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
> va:306) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
> ... 17 more