I need help with this error.

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 2020-01-03 19:51:08 MEZ
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at net.minecraftforge.fml.common.ProxyInjector.inject(ProxyInjector.java:85)
    at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:611)
    at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
    at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
    at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
    at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:593)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:98)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333)
    at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:125)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 34 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@bdc8014 from coremod FMLCorePlugin
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260)
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
    ... 36 more
Caused by: java.lang.RuntimeException: Attempted to load class bud for invalid side SERVER
    at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62)
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256)
    ... 38 more

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

-- System Details --
  Minecraft Version: 1.12.2
  Operating System: Linux (amd64) version 4.9.0-9-amd64
  Java Version: 1.8.0_211, Oracle Corporation
  Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
  Memory: 1077833152 bytes (1027 MB) / 1570242560 bytes (1497 MB) up to 4964483072 bytes (4734 MB)
  JVM Flags: 5 total; -Xmx5325M -Xms512M -XX:MaxPermSize=512m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled
  IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
  FML: MCP 9.42 Powered by Forge 14.23.5.2838 64 mods loaded, 64 mods active
       States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
       
       | State | ID                         | Version                   | Source                                           | Signature                                |
       |:----- |:-------------------------- |:------------------------- |:------------------------------------------------ |:---------------------------------------- |
       | LC    | minecraft                  | 1.12.2                    | minecraft.jar                                    | None                                     |
       | LC    | mcp                        | 9.42                      | minecraft.jar                                    | None                                     |
       | LC    | FML                        | 8.0.99.99                 | forge.jar                                        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
       | LC    | forge                      | 14.23.5.2838              | forge.jar                                        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
       | LC    | creativecoredummy          | 1.0.0                     | minecraft.jar                                    | None                                     |
       | LC    | securitycraft              | v1.8.14                   | [1.12.2]+SecurityCraft+v1.8.14.jar               | None                                     |
       | LC    | deconstruction             | 3.0.4                     | [MC1.12.2]DeconTable-3.0.4.jar                   | None                                     |
       | LC    | antiqueatlas               | 4.5.1                     | antiqueatlas-1.12.2-4.5.1.jar                    | e631d7254e451d0360d0148cb21407d5511d45e9 |
       | LC    | aqueducts                  | 0.3                       | Aqueducts-Mod-1.12.2.jar                         | None                                     |
       | LC    | jei                        | 4.15.0.293                | jei_1.12.2-4.15.0.293.jar                        | None                                     |
       | LC    | chisel                     | MC1.12.2-1.0.1.44         | Chisel-MC1.12.2-1.0.1.44.jar                     | None                                     |
       | LC    | codechickenlib             | 3.2.2.353                 | CodeChickenLib-1.12.2.jar                        | f1850c39b2516232a2108a7bd84d1cb5df93b261 |
       | LC    | extendedrenderer           | v1.0                      | coroutil-1.12.1-1.2.31.jar                       | None                                     |
       | LC    | coroutil                   | 1.12.1-1.2.31             | coroutil-1.12.1-1.2.31.jar                       | None                                     |
       | LC    | configmod                  | v1.0                      | coroutil-1.12.1-1.2.31.jar                       | None                                     |
       | LC    | cosmiclib                  | 0.4.0                     | CosmicLib-1.12.2-0.4.0.BETA.jar                  | d3974446c00f9f1d275edce305771eeddf30c658 |
       | LC    | playerrevive               | 1.0                       | PlayerRevive_v1.2.28_mc1.12.2.jar                | None                                     |
       | LC    | creativecore               | 1.9.9                     | CreativeCore_v1.9.74_mc1.12.2.jar                | None                                     |
       | LC    | customnpcs                 | 1.12                      | Custom-NPCs-Mod-1.12.2.jar                       | None                                     |
       | LC    | orelib                     | 3.6.0.1                   | OreLib-1.12.2-3.6.0.1.jar                        | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
       | LC    | dsurround                  | 3.6.0.2                   | DynamicSurroundings-1.12.2-3.6.0.2.jar           | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
       | LC    | dynamictrees               | 1.12.2-0.9.6              | DynamicTrees-1.12.2-0.9.6.jar                    | None                                     |
       | LC    | dynmap                     | 3.0-beta-4-213            | Dynmap-3.0-beta-4-forge-1.12.2.jar               | None                                     |
       | LC    | exoticbirds                | 1.0                       | Exotic+Birds+1.12.2-3.1.0.jar                    | None                                     |
       | LC    | forgelin                   | 1.8.4                     | Forgelin-1.8.4.jar                               | None                                     |
       | LC    | ftbbanners                 | 1.1.0.12                  | FTBBanners-1.1.0.12.jar                          | None                                     |
       | LC    | ftblib                     | 5.4.4.5                   | FTBLib-5.4.4.5.jar                               | None                                     |
       | LC    | ftbutilities               | 5.4.0.124                 | FTBUtilities-5.4.0.124.jar                       | None                                     |
       | LC    | guardillagers              | 1.0.1                     | guardillagers-1.12.2-1.0.1.jar                   | None                                     |
       | LC    | overlord                   | 2.4.14                    | Overlord-1.12.2-2.4.14.jar                       | None                                     |
       | LC    | guideapi                   | 1.12-2.1.8-63             | Guide-API-1.12-2.1.8-63.jar                      | None                                     |
       | LC    | astikorcarts               | 1.12.2-0.1.2.7            | Horse-Carts-Mod-1.12.2.jar                       | None                                     |
       | LC    | howlingmoon                | 0.9                       | howlingmoon-1.12.2-0.9.jar                       | None                                     |
       | LC    | ichunutil                  | 7.2.2                     | iChun-Util-Mod-1.12.2.jar                        | 4db5c2bd1b556f252a5b8b54b256d381b2a0a6b8 |
       | LC    | inventorytweaks            | 1.63+release.109.220f184  | InventoryTweaks-1.63.jar                         | 55d2cd4f5f0961410bf7b91ef6c6bf00a766dcbe |
       | LC    | jjcoa                      | 1.0.9                     | JJ+Coats+of+Arms+1.12-1.12.2-v1.0.9.jar          | None                                     |
       | LC    | jaff                       | 1.7_for_1.12              | JustAFewFish-1.7_for_1.12.jar                    | None                                     |
       | L     | kaishiweapons              | v2018.01                  | Kaishis-Weapon-Pack-Mod-1.12.2.jar               | None                                     |
       | L     | matchlockweapons           | 0.8                       | Matchlock+Guns+Mod-1.12.2-7a.jar                 | None                                     |
       | L     | mdxlib                     | 3.0.0.21                  | MDXLib-1.12.2.jar                                | None                                     |
       | L     | mimic                      | 1.5.0                     | Mimic.jar                                        | None                                     |
       | L     | minetraps                  | 1.0.4                     | MineTraps-Mod-1.12.2.jar                         | None                                     |
       | L     | llibrary                   | 1.7.19                    | llibrary-1.7.19-1.12.2.jar                       | None                                     |
       | L     | mowziesmobs                | 1.5.4                     | mowziesmobs-1.5.4.jar                            | None                                     |
       | L     | notenoughscaffold          | 1.10                      | Not-Enough-Scaffold-Mod-1.12.2.jar               | None                                     |
       | L     | nei                        | 2.4.2                     | NotEnoughItems-1.12.2-2.4.2.240-universal.jar    | None                                     |
       | L     | oreexcavation              | 1.4.140                   | OreExcavation-1.4.140.jar                        | None                                     |
       | L     | persistentbits             | 1.0.6a                    | PersistentBits-1.12-1.0.6a.jar                   | None                                     |
       | L     | corerm                     | 1.3.3                     | RikMuldsCore-1.12.2.jar                          | None                                     |
       | L     | sgcraft                    | 1.13.2                    | SGCraft-2.0.0-beta-6.jar                         | None                                     |
       | L     | storagenetwork             | 1.7.10                    | SimpleStorageNetwork-1.12.2-1.7.10.jar           | None                                     |
       | L     | tickratechanger            | 1.0.14                    | TickrateChanger-1.0.14.jar                       | None                                     |
       | L     | sleepingoverhaul           | 1.0.0                     | SleepingOverhaul-1.12.2-1.0.0.jar                | None                                     |
       | L     | spartanshields             | 1.5.4                     | SpartanShields-1.12.2-1.5.4.jar                  | None                                     |
       | L     | tlauncher_custom_cape_skin | 1.4                       | tlskincape_1.12.2-1.4.jar                        | None                                     |
       | L     | torochess                  | 1.12.2-3                  | ToroChess-Mod-1.12.2.jar                         | None                                     |
       | L     | trapcraft                  | v2.4.3a                   | Trapcraft-Mod-1.12.2.jar                         | None                                     |
       | L     | uppers                     | 0.0.6                     | Uppers-Mod-1.12.2.jar                            | None                                     |
       | L     | vampirism                  | 1.5.6                     | Vampirism-1.12.2-1.5.6.jar                       | None                                     |
       | L     | teamlapen-lib              | 1.5.6                     | Vampirism-1.12.2-1.5.6.jar                       | None                                     |
       | L     | vanillafix                 | 1.0.10-SNAPSHOT           | VanillaFix-1.0.10-99.jar                         | None                                     |
       | L     | waddles                    | 0.6.0                     | Waddles-1.12.2-0.6.0.jar                         | None                                     |
       | L     | warsftbdynmap              | 1.0.4                     | WarsFtbDynmap-1.0.4.jar                          | None                                     |
       | L     | worldprimer                | 0.6.0-dev.20190525.121747 | worldprimer-1.12.2-0.6.0-dev.20190525.121747.jar | None                                     |
  Loaded coremods (and transformers): llibrary (llibrary-core-1.0.11-1.12.2.jar)
                                        net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
                                        net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
                                      Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
                                        invtweaks.forge.asm.ContainerTransformer
                                      CreativePatchingLoader (CreativeCore_v1.9.74_mc1.12.2.jar)
                                        
                                      CosmicLibFakeCoreMod (CosmicLib-1.12.2-0.4.0.BETA.jar)
                                        
                                      CTMCorePlugin (Connected-Textures-Mod-1.12.2.jar)
                                        team.chisel.ctm.client.asm.CTMTransformer
                                      ForgelinPlugin (Forgelin-1.8.4.jar)
                                        
                                      TickrateChanger (TickrateChanger-1.0.14.jar)
                                        me.guichaguri.tickratechanger.TickrateTransformer
                                      VanillaFixLoadingPlugin (VanillaFix-1.0.10-99.jar)
                                        
                                      TransformLoader (DynamicSurroundings-1.12.2-3.6.0.2.jar)
                                        
                                      FMLModule (MDXLib-1.12.2.jar)
                                        com.asx.mdx.AccessTransformer
                                      TLSkinCapeHookLoader (tlskincape_1.12.2-1.4.jar)
                                        gloomyfolken.hooklib.minecraft.PrimaryClassTransformer
  Suspected Mods: Unknown
  Profiler Position: N/A (disabled)
  Is Modded: Definitely; Server brand changed to 'fml,forge'
  Type: Dedicated Server (map_server.txt)