Bukkit

See the error log when I use the command "/rea item 264 32":

15.12 13:35:22 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:435)
15.12 13:35:22 [Server] INFO at java.lang.reflect.Method.invoke(Unknown Source)
15.12 13:35:22 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
15.12 13:35:22 [Server] INFO at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
15.12 13:35:22 [Server] INFO at de.diddiz.LogBlock.listeners.ChestAccessLogging.onInventoryOpen(ChestAccessLogging.java:61)
15.12 13:35:22 [Server] INFO at org.bukkit.craftbukkit.v1_6_R3.inventory.CraftInventory.getContents(CraftInventory.java:42)
15.12 13:35:22 [Server] INFO Caused by: java.lang.AbstractMethodError
15.12 13:35:22 [Server] INFO at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
15.12 13:35:22 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662)
15.12 13:35:22 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:780)
15.12 13:35:22 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:327)
15.12 13:35:22 [Server] INFO at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:913)
15.12 13:35:22 [Server] INFO at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:34)
15.12 13:35:22 [Server] INFO at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
15.12 13:35:22 [Server] INFO at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:233)
15.12 13:35:22 [Server] INFO at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:470)
15.12 13:35:22 [Server] INFO at net.minecraft.network.packet.Packet15Place.func_73279_a(Packet15Place.java:79)
15.12 13:35:22 [Server] INFO at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:880)
15.12 13:35:22 [Server] INFO at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:542)
15.12 13:35:22 [Server] INFO at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:595)
15.12 13:35:22 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
15.12 13:35:22 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
15.12 13:35:22 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:31)
15.12 13:35:22 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
15.12 13:35:22 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:437)
15.12 13:35:22 [Server] INFO org.bukkit.event.EventException
15.12 13:35:22 [Server] SEVERE Could not pass event InventoryOpenEvent to LogBlock v1.80
15.12 13:35:20 [Server] INFO ... 17 more

I removed the plugin LogBlock but the command is not working yet. I am using on modpack FTB Horizons