I was only using the Ancient Warfare 2 mod. Was it too new? I added the core mod to it and it came up with the same crash, this crash :

 

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 8/5/18 1:34 AM
Description: Exception in server tick loop

net.minecraftforge.fml.common.MultipleModsErrored
    at net.minecraftforge.fml.common.Loader.sortModList(Loader.java:300)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:547)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:97)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:331)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:122)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:483)
    at java.lang.Thread.run(Thread.java:748)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.12
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_171, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 772471960 bytes (736 MB) / 891289600 bytes (850 MB) up to 2854223872 bytes (2722 MB)
    JVM Flags: 0 total;
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.40 Powered by Forge 14.21.1.2442 11 mods loaded, 11 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    U    minecraft{1.12} [Minecraft] (minecraft.jar)
    U    mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
    U    FML{8.0.99.99} [Forge Mod Loader] (forge-1.12-14.21.1.2442-universal.jar)
    U    forge{14.21.1.2442} [Minecraft Forge] (forge-1.12-14.21.1.2442-universal.jar)
    U    ancientwarfareautomation{1.12.2-2.6.1.298} [Ancient Warfare Automation] (ancientwarfare-1.12.2-2.6.1.298.jar)
    U    ancientwarfare{1.12.2-2.6.1.298} [Ancient Warfare Core] (ancientwarfare-1.12.2-2.6.1.298.jar)
    U    ancientwarfarenpc{1.12.2-2.6.1.298} [Ancient Warfare NPCs] (ancientwarfare-1.12.2-2.6.1.298.jar)
    U    ancientwarfarestructure{1.12.2-2.6.1.298} [Ancient Warfare Structures] (ancientwarfare-1.12.2-2.6.1.298.jar)
    U    ancientwarfarevehicle{1.12.2-2.6.1.298} [Ancient Warfare Vehicles] (ancientwarfare-1.12.2-2.6.1.298.jar)
    U    codechickenlib{3.2.1.350} [CodeChicken Lib] (CodeChickenLib-1.12.2-3.2.1.350-universal.jar)
    U    mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.12.jar)
    Loaded coremods (and transformers):
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

 

 

 

Please help.

-MystGamesYT

Looks like you’re trying to tun 1.12.2 mods on 1.12(.0) Forge, update Forge to 1.12.2

lol im an idiot.. thanks guys