[22:48:43 ERROR]: Could not pass event BlockPlaceEvent to FurnaceLevels v1.3
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:126) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.ItemStack.placeItem(ItemStack.java:158) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:503) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:759) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_191]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_191]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [spigot1.8.8.jar:git-Spigot-fdc1440-53fac9f]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [spigot1.8.8.j        at vpd.bowandaero12.furnacelv.items.ItemHandler.customItem(ItemHandler.java:194) ~[?:?]
        at vpd.bowandaero12.furnacelv.items.ItemHandler.onBlockPlace(ItemHandler.java:60) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_1
91]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?
:1.8.0_191]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_191]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot1.8.
8.jar:git-Spigot-fdc1440-53fac9f]
        ... 18 more