Помогите internal server error

не могу зайти, но некоторые игроки могут
MCPC 1.5.2

Spoiler

[WARNING] Failed to handle packet for Necrotic [/77.37.140.228:53750]: net.minecraft.util.ReportedException: Loading entity NBT
net.minecraft.util.ReportedException: Loading entity NBT
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1831)
at net.minecraft.world.storage.SaveHandler.func_75752_b(SaveHandler.java:315)
at net.minecraft.server.management.ServerConfigurationManager.func_72380_a(ServerConfigurationManager.java:294)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:140)
at net.minecraft.network.NetLoginHandler.completeConnection(NetLoginHandler.java:215)
at cpw.mods.fml.common.network.FMLNetworkHandler.handleClientConnection(FMLNetworkHandler.java:171)
at cpw.mods.fml.common.network.FMLNetworkHandler.onConnectionReceivedFromClient(FMLNetworkHandler.java:124)
at net.minecraft.network.NetLoginHandler.func_72529_d(NetLoginHandler.java:191)
at net.minecraft.network.NetLoginHandler.func_72532_c(NetLoginHandler.java:79)
at net.minecraft.server.ServerListenThread.func_71766_a(ServerListenThread.java:57)
at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:29)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:847)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:716)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:600)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.NullPointerException
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1818)
... 15 more