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[JaHtz]

Hello,
since a few days i host a ftb infinit server for my friends and me. Today we wanted to play too but after i connected one of my friends wanted to join too, but i got kicked and he could play. When I rejoined, he got kicked. I already restarted the pc, loaded an old backup, reinstalled the server but still the same problem.
Pastebin Link: http://pastebin.com/8yKYyKQ9

Consol:
[15:02:22] [User Authenticator #2/INFO]: UUID of player minecraft1509 is 1fcbb7ee-62ab-4e8d-9ef3-1dc857277218
[15:02:23] [Netty IO #4/INFO] [FML]: Client protocol version 2
[15:02:23] [Netty IO #4/INFO] [FML]: Client attempting to join with 175 mods : BuildCraft|Silicon@7.1.16,ProjRed|Expansion@4.7.0pre12.95,ForgeMicroblock@1.2.0.345,iChunUtil@4.2.2,rftools@4.23,ExtraBees@2.0-pre14,PortalGun@4.0.0-beta-6,ThaumicExploration@0.6.0,springboards@0.1,EnderZoo@1.7.10-1.0.15.32,MineFactoryReloaded|CompatTwilightForest@1.7.10R2.8.1,MagicBees@2.4.3,Botany@2.0-pre14,ProjRed|Integration@4.7.0pre12.95,endercore@1.7.10-0.2.0.36_beta,Mystcraft@0.12.3.02,MineFactoryReloaded|CompatProjRed@1.7.10R2.8.1,BuildCraft|Robotics@7.1.16,McMultipart@1.2.0.345,BiomesOPlenty@2.1.0,props@2.3.3,ExtraUtilities@1.2.12,Railcraft@9.12.2.0,guideapi@1.7.10-1.0.1-20,MineFactoryReloaded|CompatRailcraft@1.7.10R2.8.1,WR-CBE|Addons@1.4.1.9,MineFactoryReloaded|CompatForestry@1.7.10R2.8.1,IC2NuclearControl@2.4.1a,ThermalFoundation@1.7.10R1.2.5,MineFactoryReloaded|CompatVanilla@1.7.10R2.8.1,ForgeMultipart@1.2.0.345,headcrumbs@1.7.4,StevesCarts@2.0.0.b18,BrandonsCore@1.0.0.12,RedstoneArsenal@1.7.10R1.1.2,MCFrames@1.0,CoFHCore@1.7.10R3.1.3,ResourceLoader@1.3,neresources@0.1.0.ManuallyBuilt,BiblioWoodsForestry@1.7,FastCraft@1.23,OpenPeripheral@0.5.1,Forge@10.13.4.1614,ExtraTrees@2.0-pre14,HatStand@4.0.0,StorageDrawers@1.7.10-1.10.1,gendustry@1.6.3.132,ThaumicTinkerer@unspecified,AdvancedSolarPanel@1.7.10-3.5.1,BuildCraft|Energy@7.1.16,modtweaker2@0.9.5,IC2@2.2.823-experimental,JABBA@1.2.2,ExtraTiC@1.4.6,MineFactoryReloaded|CompatIC2@1.7.10R2.8.1,ProjRed|Transportation@4.7.0pre12.95,FML@7.10.99.99,Natura@2.2.0,NEIAddons|Forestry@1.12.14.40,TiCTooltips@1.2.5,ThE-core@1.0.0.1,BiblioWoodsNatura@1.5,<CoFH ASM>@000,NEIAddons|CraftingTables@1.12.14.40,NEIAddons|ExNihilo@1.12.14.40,WailaHarvestability@1.1.6,ThermalDynamics@1.7.10R1.2.0,ProjRed|Illumination@4.7.0pre12.95,TMechworks@0.2.15.106,fastleafdecay@1.4,Botania@r1.8-249,Hats@4.0.1,LogisticsPipes@0.9.3.126,Avaritia@1.11,FTBU@1.0.18.2,FTBT@1.0.2,NotEnoughItems@1.0.5.120,Thaumcraft@4.2.3.5,Waila@1.5.10,ProjRed|Compatibility@4.7.0pre12.95,ForgeRelocation@0.0.1.4,extracells@2.3.14,TConstruct@1.7.10-1.8.8.build988,simplyjetpacks@1.5.3,StevesFactoryManager@A93,appliedenergistics2-core@rv3-beta-6,NEIAddons@1.12.14.40,BinnieCore@2.0-pre14,inpure|core@1.7.10R1.0.0B9,StorageDrawersForestry@1.7.10-1.1.2,BiblioCraft@1.11.5,BuildCraft|Core@7.1.16,OpenModsCore@0.9.1,ImmersiveEngineering@0.7.7,SolarExpansion@1.6a,bdlib@1.9.4.109,NEIAddons|Developer@1.12.14.40,tcinventoryscan@1.0.11,wawla@1.3.1,RelocationFMP@0.0.1.2,Genetics@2.0-pre14,mcp@9.05,Mantle@1.7.10-0.3.2.jenkins191,ProjRed|Transmission@4.7.0pre12.95,journeymap@5.1.4p1,appliedenergistics2@rv3-beta-6,thaumcraftneiplugin@@VERSION@,WR-CBE|Logic@1.4.1.9,OpenPeripheralIntegration@0.5,MineFactoryReloaded|CompatTConstruct@1.7.10R2.8.1,MineFactoryReloaded|CompatAppliedEnergistics@1.7.10R2.8.1,DraconicEvolution@1.0.2h,WR-CBE|Core@1.4.1.9,inventorytweaks@1.59-dev-152-cf6e263,MineFactoryReloaded|CompatBuildCraft@1.7.10R2.8.1,StorageDrawersMisc@1.7.10-1.1.2,harvestcraft@1.7.10j,Morpheus@1.7.10-1.6.21,ThermalExpansion@1.7.10R4.1.3,TwilightForest@2.3.7,BuildCraft|Factory@7.1.16,MineFactoryReloaded|CompatThaumcraft@1.7.10R2.8.1,GraviSuite@1.7.10-2.0.3,AgriCraft@1.7.10-1.5.0,OpenPeripheralCore@1.3,NEIAddons|AppEng@1.12.14.40,OpenBlocks@1.5.1,EnderStorage@1.4.7.37,ForbiddenMagic@1.7.10-0.575,EnderTech@1.7.10-0.3.2.405,FTBL@1.0.18.2,MineFactoryReloaded|CompatForgeMicroblock@1.7.10R2.8.1,CarpentersBlocks@3.3.8,MineFactoryReloaded@1.7.10R2.8.1,StevesWorkshop@0.5.1,EnderIO@1.7.10-2.3.0.428_beta,BuildCraft|Compat@7.1.5,Translocator@1.1.2.16,ComputerCraft@1.75,funkylocomotion@1.0,CustomMainMenu@1.9.2,neiintegration@1.1.2,AWWayofTime@v1.3.3,MrTJPCoreMod@1.1.0.33,immersiveintegration@0.6.8,IronChest@6.0.62.742,NEIAddons|Botany@1.12.14.40,MineFactoryReloaded|CompatThermalExpansion@1.7.10R2.8.1,thaumicenergistics@1.0.0.5,CodeChickenCore@1.0.7.47,BigReactors@0.4.3A,ChickenChunks@1.3.4.19,MineTweaker3@3.0.10,BinniePatcher@1.8.2,ThaumicTinkerer-preloader@0.1,aobd@2.9.2,NetherOres@1.7.10R2.3.1,debug@1.0,StorageDrawersNatura@1.7.10-1.1.1,BuildCraft|Transport@7.1.16,StorageDrawersBop@1.7.10-1.1.1,chisel@2.9.5.11,Baubles@1.0.1.10,StevesAddons@0.10.16,ProjRed|Core@4.7.0pre12.95,denseores@1.0,ProjRed|Exploration@4.7.0pre12.95,witchery@0.24.1,Forestry@4.2.15.63,OpenMods@0.9.1,BiblioWoodsBoP@1.9,PTRModelLib@1.0.0,BuildCraft|Builders@7.1.16,ChocoPatcher@1.1,runicdungeons@1.1.7b
[15:02:23] [Netty IO #4/INFO] [FML]: Attempting connection with missing mods [] at CLIENT
[15:02:23] [Netty IO #4/INFO] [journeymap]: CLIENT
[15:02:24] [Server thread/INFO] [FML]: [Server thread] Server side modded connection established
[15:02:24] [Server thread/INFO] [mcjty.lib.varia.Logging]: SMP: Sync dimensions to client
[15:02:24] [Server thread/INFO]: minecraft1509[/25.55.225.224:50397] logged in with entity id 2705 at (245.31426380983083, 69.0, -386.71238156509065)
[15:02:24] [Server thread/INFO]: minecraft1509 joined the game
[15:02:24] [Netty IO #2/ERROR] [FML]: NetworkDispatcher exception
io.netty.handler.codec.EncoderException: java.lang.NullPointerException
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:129) ~[MessageToByteEncoder.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637) ~[DefaultChannelHandlerContext.class:?]
at cpw.mods.fml.common.network.handshake.NetworkDispatcher.write(NetworkDispatcher.java:440) ~[NetworkDispatcher.class:?]
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) ~[DefaultChannelHandlerContext.class:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893) ~[DefaultChannelPipeline.class:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:239) ~[AbstractChannel.class:?]
at net.minecraft.network.NetworkManager$1.run(NetworkManager.java:174) [ek.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:354) [SingleThreadEventExecutor.class:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:348) [NioEventLoop.class:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [SingleThreadEventExecutor$2.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]
Caused by: java.lang.NullPointerException
at net.minecraft.network.PacketBuffer.func_150785_a(SourceFile:141) ~[et.class:?]
at net.minecraft.network.play.server.S0CPacketSpawnPlayer.func_148840_b(SourceFile:81) ~[gb.class:?]
at net.minecraft.util.MessageSerializer.encode(SourceFile:38) ~[fa.class:?]
at net.minecraft.util.MessageSerializer.encode(SourceFile:14) ~[fa.class:?]
at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:111) ~[MessageToByteEncoder.class:?]
... 15 more
[15:02:24] [Server thread/INFO] [EnderCore]: Sending server configs to client for com.enderio.core.common.config.ConfigHandler
[15:02:24] [Server thread/INFO] [AgriCraft]: Sending mutations to player: minecraft1509
[15:02:24] [Server thread/INFO] [Waila]: Player EntityPlayerMP['minecraft1509'/2705, l='world', x=245,31, y=69,00, z=-386,71] connected. Sending ping
[15:02:24] [Server thread/INFO] [mcjty.lib.varia.Logging]: SMP: Player logged in: Sync diminfo to clients
[15:02:24] [Server thread/INFO] [mcjty.lib.varia.Logging]: Sync dimension info to clients!
[15:02:24] [Server thread/INFO] [mcjty.lib.varia.Logging]: Send validation data to the client
[15:02:24] [Server thread/INFO]: JaHtz lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[15:02:24] [Server thread/INFO]: JaHtz left the game
[15:02:26] [Server thread/INFO] [STDOUT]: [mcjty.lib.preferences.PreferencesProperties:syncToClient:38]: syncToClient: style = STYLE_FLAT_GRADIENT

Thanks for helping
LG JaHtz