Modded server keeps crashing [1.7.10]

A friend of mine made a modpack and wants me to set up a server with said modpack. I followed a tutorial and when I try to run the server it crashes nearly instantly. I have the crash report that the server gave me and I'll paste it below. Any help would be greatly appreciated:

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 10/12/17 9:46 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: cpw.mods.fml.common.FMLContainer
    at cpw.mods.fml.common.Loader.identifyMods(Loader.java:345)
    at cpw.mods.fml.common.Loader.loadMods(Loader.java:489)
    at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
    at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:314)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:117)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
    at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.FMLContainer
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:58)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at cpw.mods.fml.common.Loader.identifyMods(Loader.java:340)
    ... 6 more
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file cpw/mods/fml/common/FMLContainer
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
    ... 12 more

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

-- System Details --
Details:
    Minecraft Version: 1.7.10
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_121, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 453227376 bytes (432 MB) / 558366720 bytes (532 MB) up to 1886912512 bytes (1799 MB)
    JVM Flags: 0 total; 
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 1 mod loaded, 0 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
        mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)