java.lang.IllegalArgumentException: n must be positive
        at java.util.Random.nextInt(Unknown Source)
        at net.minecraft.server.v1_6_R3.EnchantmentManager.a(SourceFile:144)
        at net.minecraft.server.v1_6_R3.EntityLiving.c(EntityLiving.java:920)
        at net.minecraft.server.v1_6_R3.EntityHuman.d(EntityHuman.java:782)
        at net.minecraft.server.v1_6_R3.EntityLiving.damageEntity(EntityLiving.java:665)
        at net.minecraft.server.v1_6_R3.EntityHuman.damageEntity(EntityHuman.java:719)
        at net.minecraft.server.v1_6_R3.EntityPlayer.damageEntity(EntityPlayer.java:399)
        at net.minecraft.server.v1_6_R3.EntityEnderPearl.a(EntityEnderPearl.java:52)
        at net.minecraft.server.v1_6_R3.EntityProjectile.l_(EntityProjectile.java:156)
        at net.minecraft.server.v1_6_R3.World.entityJoinedWorld(World.java:1492)
        at net.minecraft.server.v1_6_R3.World.playerJoinedWorld(World.java:1467)
        at net.minecraft.server.v1_6_R3.World.tickEntities(World.java:1336)
        at net.minecraft.server.v1_6_R3.WorldServer.tickEntities(WorldServer.java:517)
        at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:573)
        at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
        at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)