My Tekkit server doesn't start because of a NPE

[fljmayer]

My Tekkit server has been running fine for several months, but since today I cannot connect to it. I found the exceptions below in the ForgeModLoader-server-0.log file. I am stumped, the only possible reason could be power outage I had today. Does anybody have an idea what I can do?

2013-10-17 20:30:23 [sEVERE] [ForgeModLoader] A fatal exception occurred during the server starting event

java.lang.NullPointerException

    at universalelectricity.prefab.flag.ModFlag.readFromNBT(ModFlag.java:34)

    at universalelectricity.prefab.flag.ModFlag.<init>(ModFlag.java:27)

    at atomicscience.ZhuYao.serverStarting(ZhuYao.java:719)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:616)

    at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:494)

    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:616)

    at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)

    at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)

    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

    at com.google.common.eventbus.EventBus.post(EventBus.java:267)

    at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:192)

    at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:172)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:616)

    at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)

    at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)

    at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)

    at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)

    at com.google.common.eventbus.EventBus.post(EventBus.java:267)

    at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:103)

    at cpw.mods.fml.common.Loader.serverStarting(Loader.java:740)

    at cpw.mods.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:314)

    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:205)

    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:431)

    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

2013-10-17 20:30:23 [iNFO] [Minecraft-Server] Turned off world auto-saving

2013-10-17 20:30:23 [iNFO] [Minecraft-Server] Saving...

2013-10-17 20:30:23 [iNFO] [Minecraft-Server] An unknown error occurred while attempting to perform this command

2013-10-17 20:30:23 [iNFO] [sTDERR] java.lang.NullPointerException

2013-10-17 20:30:23 [iNFO] [sTDERR]    at atomicscience.ZhuYao.worldSave(ZhuYao.java:731)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraftforge.event.ASMEventHandler_10_ZhuYao_worldSave_Save.invoke(.dynamic)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraftforge.event.EventBus.post(EventBus.java:108)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:907)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.command.CommandServerSaveAll.func_71515_b(SourceFile:34)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:87)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:314)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.server.dedicated.DedicatedServer.func_71228_a(DedicatedServer.java:241)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:480)

2013-10-17 20:30:23 [iNFO] [sTDERR]    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

2013-10-17 20:30:23 [iNFO] [Minecraft-Server] Turned on world auto-saving

[fljmayer]

When I remove Atomic_Science_v0.6.2.117.jar from the server's mods folder, the server starts up without problems. However, when I try to connect with the client, ForgeModloader complains about some missing ids and doesn't let me connect to the server.

[Nightreaver]

yes, it will complain about missing Ids when you remove the mods

sometimes a crash will cause corrupted config files or some other kinds of file corruption

try re-download the mod/config file