服务器进不去，其他玩家可以进去，我进不去，我自己电脑映射开的服

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这是报错，有没有大佬帮我解决一下子，服务器开着，我自己电脑映射的，只能我自己进去一个号，其他人都进不去，一进去就显示这样的报错，有没有大佬帮我看看是什么问题
13:45:27 [严重] Cannot Hotload Dim: Could not get provider type for dimension 61889, does not exist
13:45:27 [信息] Disconnecting Soking [ip地址，请无视]: Internal server error
13:45:27 [严重] Error handling login related packet - connection from Soking [/127.0.0.1:51772] refused
net.minecraft.util.ReportedException: Loading entity NBT
        at net.minecraft.entity.Entity.func_70020_e(Entity.java:1972)
        at net.minecraft.world.storage.SaveHandler.func_75752_b(SaveHandler.java:318)
        at net.minecraft.server.management.ServerConfigurationManager.func_72380_a(ServerConfigurationManager.java:300)
        at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:145)
        at net.minecraft.network.NetLoginHandler.completeConnection(NetLoginHandler.java:223)
        at cpw.mods.fml.common.network.FMLNetworkHandler.handleClientConnection(FMLNetworkHandler.java:168)
        at cpw.mods.fml.common.network.FMLNetworkHandler.onConnectionReceivedFromClient(FMLNetworkHandler.java:121)
        at net.minecraft.network.NetLoginHandler.func_72529_d(NetLoginHandler.java:198)
        at net.minecraft.network.NetLoginHandler.func_72532_c(NetLoginHandler.java:82)
        at net.minecraft.server.ServerListenThread.func_71766_a(ServerListenThread.java:57)
        at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:33)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:910)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:777)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:659)
        at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
Caused by: java.lang.NullPointerException
        at net.minecraft.entity.Entity.func_70020_e(Entity.java:1959)
        ... 15 more