Server is crashing

Hello everyone, I recently wanted to play with friends and created a mod pack after creating run.bat and firing in the console, an error appeared Report crash is :

java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
    at com.sekwah.sekcphysics.ragdoll.Ragdolls.<clinit>(Ragdolls.java:23)
    at com.sekwah.sekcphysics.SekCPhysics.<clinit>(SekCPhysics.java:58)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:539)
    at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    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$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
    at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$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$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:595)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:98)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333)
    at net.minecraft.server.dedicated.DedicatedServer.init(DedicatedServer.java:125)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 35 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@2787de58 from coremod FMLCorePlugin
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260)
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
    ... 37 more
Caused by: java.lang.RuntimeException: Attempted to load class bib for invalid side SERVER
    at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62)
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256)
    ... 39 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: Windows 10 (amd64) version 10.0
  Java Version: 1.8.0_251, Oracle Corporation
  Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
  Memory: 1255177744 bytes (1197 MB) / 2022178816 bytes (1928 MB) up to 3817865216 bytes (3641 MB)
  JVM Flags: 2 total; -Xms1024M -Xmx4096M
  IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
  FML: MCP 9.42 Powered by Forge 14.23.5.2846 51 mods loaded, 51 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-1.12.2-14.23.5.2846-universal.jar        | None                                     |
       | LC    | forge             | 14.23.5.2846               | forge-1.12.2-14.23.5.2846-universal.jar        | None                                     |
       | LC    | cubicchunkscore   | 1.12.2-0.0.1055.0-SNAPSHOT | minecraft.jar                                  | None                                     |
       | LC    | aether_legacy     | 1.4.4                      | aether_legacy-1.12.2-v1.4.4.jar                | None                                     |
       | LC    | aquaculture       | 1.6.8                      | Aquaculture-1.12.2-1.6.8.jar                   | None                                     |
       | LC    | baubles           | 1.5.2                      | Baubles-Mod-1.12.2.jar                         | None                                     |
       | LC    | astralsorcery     | 1.10.22                    | astralsorcery-1.12.2-1.10.23.jar               | a0f0b759d895c15ceb3e3bcb5f3c2db7c582edf0 |
       | LC    | battletowers      | 1.6.4                      | BattleTowers-Mod-1.12.2.jar                    | None                                     |
       | LC    | better_diving     | 1.5.1                      | BetterDiving-1.12.2-1.5.1.jar                  | None                                     |
       | LC    | betternether      | 0.1.8.6                    | betternether-0.1.8.6.jar                       | None                                     |
       | LC    | biomesoplenty     | 7.0.1.2315                 | BiomesOPlenty-1.12.2-7.0.1.2315-universal.jar  | None                                     |
       | LC    | coralreef         | 2.0                        | CoralReef-Mod-1.12.2.jar                       | None                                     |
       | LC    | extendedrenderer  | v1.0                       | CoroUtil-1.12.2.jar                            | None                                     |
       | LC    | coroutil          | 1.12.1-1.2.19              | CoroUtil-1.12.2.jar                            | None                                     |
       | LC    | configmod         | v1.0                       | CoroUtil-1.12.2.jar                            | None                                     |
       | LC    | cubicchunks       | 1.12.2-0.0.1055.0-SNAPSHOT | CubicChunks-1.12.2-0.0.1055.0-SNAPSHOT-all.jar | None                                     |
       | LC    | dldungeonsjdg     | 1.11.2                     | Doomlike-Dungeons-Mod-1.12.2.jar               | None                                     |
       | LC    | dragonmounts      | 1.12.2-1.6.3               | DragonMounts2-1.12.2-1.6.3.jar                 | None                                     |
       | LC    | endreborn         | 0.2.1                      | End-Reborn-Mod-1.12.2.jar                      | None                                     |
       | LC    | exoticbirds       | 1.0                        | Exotic+Birds+1.12.2-3.1.0.jar                  | None                                     |
       | LC    | extragems         | 1.2.8                      | Extra-Gems-Mod-1.12.2.jar                      | None                                     |
       | LC    | familiarfauna     | 1.0.11                     | FamiliarFauna-1.12.2-1.0.11.jar                | None                                     |
       | LC    | geolosys          | 3.0.10                     | Geolosys-Mod-1.12.2.jar                        | None                                     |
       | LC    | howlingmoon       | 0.9                        | howlingmoon-1.12.2-0.9.jar                     | None                                     |
       | LC    | infernalmobs      | 1.7.6                      | Infernal-Mobs-Mod-1.12.2.jar                   | None                                     |
       | LC    | ironchest         | 1.12.2-7.0.67.844          | ironchest-1.12.2-7.0.67.844.jar                | None                                     |
       | LC    | jei               | 4.15.0.293                 | jei_1.12.2-4.15.0.293.jar                      | None                                     |
       | LC    | labyrinth         | ${version}                 | Labyrinth-1.12.2-1.0.jar                       | None                                     |
       | LC    | levelup2          | ${version}                 | Level-Up-Mod-1.12.2.jar                        | None                                     |
       | LC    | ltn               | 1.2.1                      | Light+the+Night-1.2.1.jar                      | None                                     |
       | LC    | lostcities        | 2.0.22                     | lostcities-1.12-2.0.22.jar                     | None                                     |
       | LC    | lycanitesmobs     | 2.0.7.2 - MC 1.12.2        | lycanitesmobs-1.12.2-2.0.7.2.jar               | None                                     |
       | LC    | mocreatures       | 12.0.5                     | Mo-Creatures-Mod-1.12.2.jar                    | None                                     |
       | LC    | nt                | 1.0                        | Novam-Terram-Mod-1.12.2.jar                    | None                                     |
       | LC    | pirates           | 0.0.6                      | pirates-0.0.6B.jar                             | None                                     |
       | LC    | roguelike         | 1.7.2                      | RoguelikeDungeons-1.12.2.jar                   | None                                     |
       | LC    | ruins             | 17.2                       | Ruins-Mod-1.12.2.jar                           | None                                     |
       | L     | sekcphysics       | 0.1.0                      | sekcphysics-0.1.0.jar                          | None                                     |
       | L     | sereneseasons     | 1.2.18                     | SereneSeasons-1.12.2-1.2.18-universal.jar      | None                                     |
       | L     | mo                | 1.0                        | Sulfur-and-Potassium-Mod-1.12.2.jar            | None                                     |
       | L     | tombstone         | 3.7.3                      | tombstone-3.7.3-1.12.2.jar                     | None                                     |
       | L     | twilightforest    | 3.10.1013                  | twilightforest-1.12.2-3.10.1013-universal.jar  | None                                     |
       | L     | vampirism         | 1.6.2                      | Vampirism-1.12.2-1.6.2.jar                     | None                                     |
       | L     | teamlapen-lib     | 1.6.2                      | Vampirism-1.12.2-1.6.2.jar                     | None                                     |
       | L     | vanillafix        | 1.0.10-150                 | VanillaFix-1.0.10-150.jar                      | None                                     |
       | L     | warpbook          | @VERSION@                  | Warp-Book-Mod-1.12.2.jar                       | None                                     |
       | L     | weather2          | 1.12.1-2.6.12              | Weather-Storms-Tornadoes-Mod-1.12.2.jar        | None                                     |
       | L     | xpbook            | v1.1.4                     | xptome-1.12.2-v1.1.4.jar                       | None                                     |
       | L     | betteranimalsplus | 9.0.1                      | betteranimalsplus-1.12.2-9.0.1.jar             | None                                     |
  Loaded coremods (and transformers): SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
                                        sereneseasons.asm.transformer.EntityRendererTransformer
                                        sereneseasons.asm.transformer.WorldTransformer
                                      VanillaFixLoadingPlugin (VanillaFix-1.0.10-150.jar)
                                        
                                      CubicChunksCoreMod (CubicChunks-1.12.2-0.0.1055.0-SNAPSHOT-all.jar)
                                        io.github.opencubicchunks.cubicchunks.core.asm.transformer.CubicChunksWorldEditTransformer
                                      AstralCore (astralsorcery-1.12.2-1.10.23.jar)
  Suspected Mods: SekC Physics (sekcphysics)
  Profiler Position: N/A (disabled)
  Is Modded: Definitely; Server brand changed to 'fml,forge'
  Type: Dedicated Server (map_server.txt)

I will be grateful for help and sorry for my English