error

20:29:34 [SEVERE] Could not pass event EntityDeathEvent to OtherDrops v2.8-beta5.1.1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at org.bukkit.craftbukkit.v1_4_R1.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:315)
        at net.minecraft.server.v1_4_R1.EntityLiving.dropDeathLoot(EntityLiving.java:930)
        at net.minecraft.server.v1_4_R1.EntityLiving.die(EntityLiving.java:878)
        at net.minecraft.server.v1_4_R1.EntityLiving.damageEntity(EntityLiving.java:758)
        at net.minecraft.server.v1_4_R1.EntityEnderDragon.dealDamage(EntityEnderDragon.java:498)
        at net.minecraft.server.v1_4_R1.EntityEnderDragon.a(EntityEnderDragon.java:487)
        at net.minecraft.server.v1_4_R1.EntityComplexPart.damageEntity(SourceFile:38)
        at net.minecraft.server.v1_4_R1.EntityArrow.j_(EntityArrow.java:226)
        at net.minecraft.server.v1_4_R1.World.entityJoinedWorld(World.java:1332)
        at net.minecraft.server.v1_4_R1.WorldServer.entityJoinedWorld(WorldServer.java:548)
        at net.minecraft.server.v1_4_R1.World.playerJoinedWorld(World.java:1313)
        at net.minecraft.server.v1_4_R1.World.tickEntities(World.java:1191)
        at net.minecraft.server.v1_4_R1.WorldServer.tickEntities(WorldServer.java:445)
        at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:580)
        at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
        at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
        at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
        at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.ClassCastException: com.gmail.zariust.otherdrops.data.RangeData cannot be cast to com.gmail.zariust.otherdrops.data.ItemData
        at com.gmail.zariust.otherdrops.drop.ItemDrop.setItemMeta(ItemDrop.java:150)
        at com.gmail.zariust.otherdrops.drop.ItemDrop.getItem(ItemDrop.java:123)
        at com.gmail.zariust.otherdrops.drop.ItemDrop.performDrop(ItemDrop.java:132)
        at com.gmail.zariust.otherdrops.drop.DropType.dropLocal(DropType.java:129)
        at com.gmail.zariust.otherdrops.drop.DropType.drop(DropType.java:109)
        at com.gmail.zariust.otherdrops.event.DropRunner.run(DropRunner.java:108)
        at com.gmail.zariust.otherdrops.OtherDrops.scheduleDrop(OtherDrops.java:398)
        at com.gmail.zariust.otherdrops.OtherDrops.performDrop(OtherDrops.java:215)
        at com.gmail.zariust.otherdrops.listener.OdEntityListener.onEntityDeath(OdEntityListener.java:80)
        at sun.reflect.GeneratedMethodAccessor385.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 21 more