EXpbank

Bonjour à tous et à toutes !
Voila serveur perso Bukkit 1.8.3.
Quelques petits problèmes dont j'aimerai avoir des conseils !
- Probleme d'expbank ?
[Server thread/ERROR]: [ExpBank] Unhandled exception number 2048 occured in onPacketSending(PacketEvent) for ExpBank
java.lang.NoSuchMethodError: com.comphenix.protocol.events.PacketContainer.getBlockPositionModifier()Lcom/comphenix/protocol/reflect/StructureModifier;
at com.empcraft.xpbank.ProtocolClass$1.onPacketSending(ProtocolClass.java:43) ~[EXPBank.jar:?]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokeSendingListener(SortedPacketListenerList.java:195) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokePacketSending(SortedPacketListenerList.java:149) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.handlePacket(PacketFilterManager.java:634) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.PacketFilterManager.invokePacketSending(PacketFilterManager.java:610) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.NettyProtocolInjector.packetQueued(NettyProtocolInjector.java:286) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.NettyProtocolInjector.onPacketSending(NettyProtocolInjector.java:254) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.ChannelInjector.processSending(ChannelInjector.java:362) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.ChannelInjector.access$500(ChannelInjector.java:61) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.ChannelInjector$5.handleScheduled(ChannelInjector.java:328) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.ChannelInjector$5.onMessageScheduled(ChannelInjector.java:296) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.ChannelProxy$2.schedulingRunnable(ChannelProxy.java:110) [ProtocolLib.jar:?]
at com.comphenix.protocol.injector.netty.EventLoopProxy.execute(EventLoopProxy.java:79) [ProtocolLib.jar:?]
at net.minecraft.server.v1_8_R2.NetworkManager.a(NetworkManager.java:183) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.NetworkManager.handle(NetworkManager.java:132) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.PlayerConnection.sendPacket(PlayerConnection.java:847) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.PlayerChunkMap$PlayerChunk.a(PlayerChunkMap.java:445) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.PlayerChunkMap$PlayerChunk.a(PlayerChunkMap.java:511) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.PlayerChunkMap$PlayerChunk.b(PlayerChunkMap.java:495) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.PlayerChunkMap.flush(PlayerChunkMap.java:59) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.WorldServer.doTick(WorldServer.java:247) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:716) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:336) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:626) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:534) [craftbukkit-1.8.3-R0.1.jar:git-Bukkit-63e28b1]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_75]

- Depuis que j'ai mis le plugin "OITC" un message dans le "tchat" s'affiche :
[CONSOLE : Please not that this command is not supported and may cause issues when using some plugins.]
[CONSOLE : If you encounter any issues please use the /stop command to restart your server.]

Des idées ?
Merci d'avance !