dmil421

Thanks for the response. I'll check into all that and update this thread when I have more to offer.

A server I assist as an Admin on has been having issues with people joining. When they attempt to join, the screen shows "A fatal error has occurred." There seem to be no issues on the server itself. The client log shows the following information: [Client thread/ERROR] [FML]: There was a critical exception handling a packet on channel FORGE [b#313] java.lang.IllegalArgumentException: value already present: cobalt [b#313] at com.google.common.collect.HashBiMap.put(HashBiMap.java:238) ~[guava-17.0.jar:?] [b#313] at com.google.common.collect.HashBiMap.put(HashBiMap.java:215) ~[guava-17.0.jar:?] [b#313] at net.minecraftforge.fluids.FluidRegistry.loadFluidDefaults(FluidRegistry.java:117) ~[FluidRegistry.class:?] [b#313] at net.minecraftforge.fluids.FluidRegistry.initFluidIDs(FluidRegistry.java:82) ~[FluidRegistry.class:?] [b#313] at net.minecraftforge.common.network.FluidIdRegistryMessageHandler.channelRead0(FluidIdRegistryMessageHandler.java:15) ~[FluidIdRegistryMessageHandler.class:?] [b#313] at net.minecraftforge.common.network.FluidIdRegistryMessageHandler.channelRead0(FluidIdRegistryMessageHandler.java:11) ~[FluidIdRegistryMessageHandler.class:?] [b#313] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) ~[simpleChannelInboundHandler.class:?] [b#313] at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) ~[DefaultChannelHandlerContext.class:?] [b#313] at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) ~[DefaultChannelHandlerContext.class:?] [b#313] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) ~[MessageToMessageDecoder.class:?] [b#313] at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) ~[MessageToMessageCodec.class:?] [b#313] at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) ~[DefaultChannelHandlerContext.class:?] [b#313] at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) ~[DefaultChannelHandlerContext.class:?] [b#313] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) ~[DefaultChannelPipeline.class:?] [b#313] at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) ~[EmbeddedChannel.class:?] [b#313] at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:77) [FMLProxyPacket.class:?] [b#313] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) [ej.class:?] [b#313] at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78) [bcx.class:?] [b#313] at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1661) [bao.class:?] [b#313] at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973) [bao.class:?] [b#313] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898) [bao.class:?] [b#313] at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?] [b#313] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_71] [b#313] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_71] [b#313] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_71] [b#313] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_71] [b#313] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?] [b#313] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?] Line 2 varies, in regards to what value is already present. We've had people report at least 5 different values, but the rest of the log is the same. There are no issues with singleplayer that we have been able to identify, even when using the same pack and configs. Using Forge 1448. AODB 2 AppleCore Applied Energistics 2 Baubles Bibliocraft Big Reactors Binne's Core Biomes O Plenty Blood Magic Botania Botany Buildcraft Carpenter's Blocks Chickenchunks Chisel Chisel Facades CodeChickenCore CoFH Core COFH Lib Compact Solars Computercraft Damage Indicators Decocraft Enchiridion Ender Storage Ender Tech EnderIO Enhanced Portals Extra Bees Extra Trees Extra Utilities ExtraCells Fastcraft Flat Signs Forbidden Magic Forestry Forge Forge Multipart Forge Multipart Integration Funky Locomotion Gendustry Genetics Gravitational Suite Harvestcraft Hat Stand Hats iChunUtils IndustrialCraft 2 Infinibows Inventory Tweaks Iron Chests Iron Chests Minecarts JABBA JourneyMap Magic Bees Malisiscore Malisisdoors Mantle Mariculture Minefactory Reloaded MineTweaker 3 MmmMmmMmmMmm Mob amputation Morph Mr. Crayfish's Furniture Mystcraft Natura NEI Addons NEI Integraton Not Enouch Items (NEI) Not Enough Keys Obsidian pressure plates OpenBlocks OpenModsLib OpenPeripheral Opis Railcraft Random Things Redstone Arsenal Roguelike Dungeons Simply Jetpacks Solar Flux Special mobs Steve's Addons Steve's Carts Steve's Factory Manager Thaumcraft 4 Thaumcraft mob aspects Thaumic Energistics Thaumic Exploration Thaumic Tinkerer Thaumic Tinkerer KAMI Thermal Expansion Thermal Foundation TIC Tooltips Tinker's Construct Tinker's Mechworks ttCore Twilight Forest WAILA WAILA Plugins WR-CBE If there is other information I can provide, please let me know. I can't find any other specific reports of this issue, other than a few Pastebins of identical issues. Apologies for lack of spoiler tags... can't seem to get them to work. Thanks.