[Tekkit Classic Console Errors - No Idea]

I also get similar to this, sometimes a few times upon startup and players join, and others randomly when players do /home /tp etc.

java.lang.Exception

at net.minecraft.server.Chunk.a(Chunk.java:675)

at net.minecraft.server.Chunk.a(Chunk.java:649)

at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:297)

at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:65)

at net.minecraft.server.ChunkRegionLoader.a(ChunkRegionLoader.java:54)

at net.minecraft.server.ChunkProviderServer.loadChunk(ChunkProviderServer.java:143)

at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:86)

at net.minecraft.server.PlayerInstance.<init>(PlayerInstance.java:26)

at net.minecraft.server.PlayerManager.a(PlayerManager.java:60)

at net.minecraft.server.PlayerManager.addPlayer(PlayerManager.java:99)

at net.minecraft.server.ServerConfigurationManager.c(ServerConfigurationManager.java:149)

at forge.PacketHandlerServer.finishLogin(PacketHandlerServer.java:169)

at forge.PacketHandlerServer.onModListResponse(PacketHandlerServer.java:108)

at forge.PacketHandlerServer.onPacketData(PacketHandlerServer.java:42)

at forge.MessageManager.dispatchIncomingMessage(MessageManager.java:419)

at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1381)

at net.minecraft.server.Packet250CustomPayload.handle(SourceFile:46)

at net.minecraft.server.NetworkManager.b(NetworkManager.java:262)

at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:119)

at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:97)

at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:651)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:525)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

If any details are required, please post what info you need and i will post it. i have tried to chase down what this is but still cannot find a cause as yet.

(sorry if its nothing to do with op's issue, but looks very similar if not the same)