error

[04:16:36 ERROR]: Could not pass event ChunkPopulateEvent to MagicLoot v2.1.0org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.jva:305) ~[spigot.jar:git-Spigot-870264a-0a645a2]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jaa:62) ~[spigot.jar:git-Spigot-870264a-0a645a2]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.ava:502) [spigot.jar:git-Spigot-870264a-0a645a2]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.ava:487) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.ChunkProviderServer.getChunkAt(ChunkProiderServer.java:289) [spigot.jar:git-Spigot-870264a0a645a2]
        at net.minecraft.server.v1_8_R2.Chunk.loadNearby(Chunk.java:973) [spigo.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.ChunkProviderServer.originalGetChunkAt(hunkProviderServer.java:186) [spigot.jar:git-Spigot870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.ChunkProviderServer.getChunkAt(ChunkProiderServer.java:118) [spigot.jar:git-Spigot-870264a0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerChunkMap$PlayerChunk.<init>(PlayeChunkMap.java:337) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerChunkMap.a(PlayerChunkMap.java:93[spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerChunkMap.b(PlayerChunkMap.java:17) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerChunkMap.movePlayer(PlayerChunkMa.java:249) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerList.d(PlayerList.java:336) [spigt.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.jav:459) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PacketPlayInFlying.a(SourceFile:126) [sigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PacketPlayInFlying$PacketPlayInPositiona(SourceFile:57) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:3) [spigot.jar:git-Spigot-870264a-0a645a2]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)?:1.8.0_40]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_40]
        at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) [spigot.ja:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:12) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:68) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:51) [spigot.jar:git-Spigot-870264a-0a645a2]
        at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.jav:554) [spigot.jar:git-Spigot-870264a-0a645a2]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_40]Caused by: java.lang.IllegalArgumentException: bound must be positive
        at java.util.Random.nextInt(Unknown Source) ~[?:1.8.0_40]
        at me.mrCookieSlime.MagicLoot.ItemManager.createItem(ItemManager.java:11) ~[?:?]
        at me.mrCookieSlime.MagicLoot.ItemManager.fillChest(ItemManager.java:14) ~[?:?]
        at me.mrCookieSlime.MagicLoot.Schematic.pasteSchematic(Schematic.java:17) ~[?:?]
        at me.mrCookieSlime.MagicLoot.RuinBuilder.buildRuin(RuinBuilder.java:25 ~[?:?]
        at me.mrCookieSlime.MagicLoot.MLListener.onRuinGenerate(MLListener.java72) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:.8.0_40]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.jva:301) ~[spigot.jar:git-Spigot-870264a-0a645a2]
        ... 24 more