Problem Just one player can connect to the server

[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|[email protected],ProjRed|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],ProjRed|[email protected],[email protected]_beta,[email protected],MineFactoryReloaded|[email protected],BuildCraft|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],WR-CBE|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ThaumicTinkerer@unspecified,[email protected],BuildCraft|[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],ProjRed|[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],[email protected],<CoFH ASM>@000,NEIAddons|[email protected],NEIAddons|[email protected],[email protected],[email protected],ProjRed|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ProjRed|[email protected],[email protected],[email protected],[email protected],[email protected],StevesFactoryManager@A93,appliedenergistics2-core@rv3-beta-6,[email protected],[email protected],inpure|[email protected],[email protected],[email protected],BuildCraft|[email protected],[email protected],[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ProjRed|[email protected],[email protected],appliedenergistics2@rv3-beta-6,thaumcraftneiplugin@@VERSION@,WR-CBE|[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],WR-CBE|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],BuildCraft|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected]_beta,BuildCraft|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],NEIAddons|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],BuildCraft|[email protected],[email protected],[email protected],[email protected],[email protected],ProjRed|[email protected],[email protected],ProjRed|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],BuildCraft|[email protected],[email protected],[email protected]
[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

 

[ikreb]

I'm having the exact same problem did you do anything to the server?

 

[JaHtz]

No, i did't update FTB or the server. I havent changed anything. I just tried to start it like yesterday and the days before...

 

[ikreb]

we reinstalled our server and client's and moved the map folder over and now it works