21:27:41 [INFO]  ERROR! Woah!! An exception has been called with this
                       command!
    21:27:41 [SEVERE] java.lang.NullPointerException
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.objects.dInventory.removeBook(dInventory.java:594)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.commands.item.TakeCommand.execute(TakeCommand.java:150)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.commands.CommandExecuter.execute(CommandExecuter.java:197)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.queues.ScriptEngine.revolve(ScriptEngine.java:41)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.queues.ScriptQueue.revolve(ScriptQueue.java:487)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.queues.core.TimedQueue.access$000(TimedQueue.java:9)
    21:27:41 [SEVERE]       at net.aufdemrand.denizen.scripts.queues.core.TimedQueue$1.run(TimedQueue.java:152)
    21:27:41 [SEVERE]       at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftTask.run(CraftTask.java:53)
    21:27:41 [SEVERE]       at org.bukkit.craftbukkit.v1_6_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
    21:27:41 [SEVERE]       at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:524)
    21:27:41 [SEVERE]       at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
    21:27:41 [SEVERE]       at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
    21:27:41 [SEVERE]       at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
    21:27:41 [SEVERE]       at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)