Problem with starting Modserver (Forge) 1.12.2

My Server crashes everytime I start it (no client-side problems), does anybody see an issue?

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

Time: 2023-01-10 17:51:53 UTC
Description: Exception in server tick loop

net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/util/ITooltipFlag
at net.minecraftforge.fml.common.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:89)
at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:612)
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: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.func_71197_b(DedicatedServer.java:125)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/util/ITooltipFlag
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.getConstructor(Class.java:1825)
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:128)
at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:112)
at net.minecraftforge.fml.common.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:82)
… 31 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.util.ITooltipFlag
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
… 38 more
Caused by: java.lang.NullPointerException

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 5.4.0-135-generic
Java Version: 1.8.0_312, Temurin
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Temurin
Memory: 5354719752 bytes (5106 MB) / 6442450944 bytes (6144 MB) up to 6442450944 bytes (6144 MB)
JVM Flags: 20 total; -Xms6144M -Xmx6144M -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=32M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2860 102 mods loaded, 100 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                        | 14.23.5.2860             | forge.jar                                          | e3c3d50c7c986df74c645c0ac54639741c90a557 |
   | LC    | creativecoredummy            | 1.0.0                    | minecraft.jar                                      | None                                     |
   | LC    | micdoodlecore                |                          | minecraft.jar                                      | None                                     |
   | LC    | obfuscate                    | 0.4.2                    | minecraft.jar                                      | None                                     |
   | LC    | animalbikes                  | 1.11.2                   | Animal-Bikes-Mod-1.12.2.jar                        | None                                     |
   | LC    | applecore                    | 3.4.0                    | AppleCore-mc1.12.2-3.4.0.jar                       | None                                     |
   | LC    | jei                          | 4.16.1.302               | jei_1.12.2-4.16.1.302.jar                          | None                                     |
   | LC    | appleskin                    | 1.0.14                   | AppleSkin-mc1.12-1.0.14.jar                        | None                                     |
   | LC    | appliedenergistics2          | rv6-stable-7             | appliedenergistics2-rv6-stable-7.jar               | dfa4d3ac143316c6f32aa1a1beda1e34d42132e5 |
   | LC    | baubles                      | 1.5.2                    | Baubles-Mod-1.12.2.jar                             | None                                     |
   | LC    | artifacts                    | 1.12.2-1.2.3             | Artifacts-Mod-Forge-1.12.2.jar                     | None                                     |
   | LC    | mantle                       | 1.12-1.3.3.55            | Mantle-Mod-1.12.2.jar                              | None                                     |
   | LC    | chisel                       | MC1.12.2-1.0.2.45        | Chisel-Mod-1.12.2.jar                              | None                                     |
   | LC    | tinkers_reforged_preload     | 1.5.6                    | Tinkers-Reforged-Mod-1.12.2.jar                    | None                                     |
   | LC    | tconstruct                   | 1.12.2-2.13.0.183        | Tinkers-Construct-Mod-1.12.2.jar                   | None                                     |
   | LC    | galacticraftcore             | 4.0.2.280                | GalacticraftCore-1.12.2-4.0.2.280.jar              | None                                     |
   | LC    | galacticraftplanets          | 4.0.2.280                | Galacticraft-Planets-Mod-1.12.2.jar                | None                                     |
   | LC    | asmodeuscore                 | 0.0.30                   | AsmodeusCore-1.12.2-0.0.31.jar                     | None                                     |
   | LC    | backpack                     | 3.0.2                    | Backpacks-Mod-1.12.2.jar                           | None                                     |
   | LC    | betterslabsmod               | 0.0.7                    | Better-Slabs-Mod-1.12.2.jar                        | None                                     |
   | LC    | betterthanmending            | 1.1.2                    | Better-Than-Mending-Mod-Forge-1.12.2.jar           | None                                     |
   | LC    | betternether                 | 0.1.8.6                  | betternether-0.1.8.6.jar                           | None                                     |
   | LC    | bibliocraft                  | 2.4.6                    | BiblioCraft-Mod-1.12.2.jar                         | None                                     |
   | LC    | conarm                       | 1.2.5.10                 | Constructs-Armory-Mod-1.12.2.jar                   | b33d2c8df492beff56d1bbbc92da49b8ab7345a1 |
   | LC    | biolib                       | 1.1.3                    | biolib-1.1.3.jar                                   | None                                     |
   | LC    | biomesoplenty                | 7.0.1.2444               | Biomes-O-Plenty-Mod-1.12.2.jar                     | None                                     |
   | LC    | bspkrscore                   | 8.0.0                    | BspkrsCore-1.12.2.jar                              | None                                     |
   | LC    | camera                       | 1.0.10                   | Camera-Mod-1.12.2.jar                              | None                                     |
   | LC    | carpentersblocks             | 3.4.0-poc.5              | Carpenters-Blocks-Mod-1.12.2.jar                   | None                                     |
   | LC    | carryon                      | 1.12.3                   | Carry-On-Mod-1.12.2.jar                            | fd21553434f4905f2f73ea7838147ac4ea07bd88 |
   | LC    | chiselsandbits               | 14.33                    | chiselsandbits-14.33.jar                           | None                                     |
   | LC    | cqrepoured                   | 2.6.12B                  | Chocolate_Quest_Repoured-1.12.2-2.6.12B.jar        | None                                     |
   | LC    | corpse                       | 1.12.2-1.0.8             | corpse-1.12.2-1.0.8.jar                            | None                                     |
   | LC    | cosmeticbeds                 | 1.12.2-1.0.2.2           | Cosmetic-Beds-Mod-Forge-1.12.2.jar                 | 5d5b8aee896a4f5ea3f3114784742662a67ad32f |
   | LC    | creativecore                 | 1.10.0                   | CreativeCore-1.12.2.jar                            | None                                     |
   | LC    | customspawner                | 3.11.4                   | Custom-Mob-Spawner-Mod-1.12.2.jar                  | None                                     |
   | LC    | damageindicatorsmod          | 1.0                      | Damage-Indicators-Mod-1.12.2.jar                   | None                                     |
   | LC    | divinerpg                    | 1.7.1                    | DivineRPG-Mod-1.12.2.jar                           | None                                     |
   | LC    | derecs_emerald__obsidian_mod | 1.1.2.0                  | Emerald-Obsidian-Mod-Forge-1.12.2.jar              | None                                     |
   | LC    | endermail                    | 1.1.3                    | Ender-Mail-Mod-Forge-1.12.2.jar                    | None                                     |
   | LE    | exnihiloomnia                | 1.0                      | Ex-Nihilo-Omnia-Mod-1.12.2.jar                     | None                                     |
   | L     | ferdinandsflowers            | 1.10.4.1                 | Ferdinand's+Flowers-1.12.x-1.10.4.1.jar            | None                                     |
   | L     | forgelin                     | 1.8.4                    | Forgelin-1.8.4.jar                                 | None                                     |
   | L     | ftblib                       | 5.4.7.2                  | FTBLib-1.12.2.jar                                  | None                                     |
   | L     | ftbutilities                 | 5.4.1.131                | FTB-Utilities-Mod-1.12.2.jar                       | None                                     |
   | L     | cfm                          | 6.3.0                    | furniture-6.3.2-1.12.2.jar                         | None                                     |
   | L     | geckolib3                    | 3.0.30                   | geckolib-forge-1.12.2-3.0.31.jar                   | None                                     |
   | L     | gokistats                    | 1.2.8.4                  | Goki-Stats-Mod-1.12.2.jar                          | None                                     |
   | L     | grapplemod                   | 1.12.2-v13               | Grappling-Hook-Mod-1.12.2.jar                      | None                                     |
   | L     | ichunutil                    | 7.2.2                    | iChun-Util-Mod-1.12.2.jar                          | None                                     |
   | L     | gravitygun                   | 7.1.0                    | Gravity-Gun-Mod-1.12.2.jar                         | None                                     |
   | L     | hats                         | 7.1.1                    | iChuns-Hats-Mod-1.12.2.jar                         | None                                     |
   | L     | hatstand                     | 7.1.0                    | Hat-Stand-Mod-1.12.2.jar                           | None                                     |
   | L     | waila                        | 1.8.26                   | Hwyla-Mod-Forge-1.12.2.jar                         | None                                     |
   | L     | llibrary                     | 1.7.20                   | LLibrary-1.12.2.jar                                | None                                     |
   | L     | iceandfire                   | 1.9.1                    | Ice-and-Fire-Mod-1.12.2.jar                        | None                                     |
   | L     | mts                          | 22.5.0-BETA              | Immersive+Vehicles-1.12.2-22.5.0.jar               | None                                     |
   | L     | inventorytweaks              | 1.63+release.109.220f184 | InventoryTweaks-1.63.jar                           | None                                     |
   | L     | ironchest                    | 1.12.2-7.0.67.844        | ironchest-1.12.2-7.0.72.847.jar                    | None                                     |
   | L     | journeymap                   | 1.12.2-5.7.1             | journeymap-1.12.2-5.7.1 (1).jar                    | None                                     |
   | L     | cdm                          | 0.4.1                    | MrCrayfishs-Device-Mod-1.12.2.jar                  | None                                     |
   | L     | lightswitch                  | 1.1.1                    | Light-Switch-Mod-1.12.2.jar                        | None                                     |
   | L     | minersdream                  | 1.0.0                    | Maxilol's+Miner's+Dream+mc1.12.2+v1.1.jar          | None                                     |
   | L     | mekanism                     | 1.12.2-9.8.3.390         | Mekanism-1.12.2-9.8.3.390.jar                      | None                                     |
   | L     | mjrlegendslib                | 1.12.2-1.2.1             | MJRLegendsLib-1.12.2.jar                           | None                                     |
   | L     | mocreatures                  | 12.0.5                   | Mo-Creatures-Mod-1.12.2.jar                        | None                                     |
   | L     | moreplayermodels             | 1.12.2                   | More-Player-Models-Mod-1.12.2.jar                  | None                                     |
   | L     | morpheus                     | 1.12.2-3.5.106           | Morpheus-1.12.2-3.5.106.jar                        | None                                     |
   | L     | morph                        | 7.2.0                    | Morphing-Mod-1.12.2.jar                            | None                                     |
   | L     | vehicle                      | 0.44.0                   | MrCrayfishs-Vehicle-Mod-1.12.2.jar                 | None                                     |
   | L     | harvestcraft                 | 1.12.2zb                 | Pam's+HarvestCraft+1.12.2zg.jar                    | None                                     |
   | L     | patchouli                    | 1.0-23.6                 | Patchouli-1.0-23.6.jar                             | None                                     |
   | L     | petbat                       | 1.4.8                    | Pet-Bat-Mod-1.12.2.jar                             | None                                     |
   | L     | pixelmon                     | 8.4.2                    | Pixelmon-1.12.2-8.4.2-universal.jar                | None                                     |
   | L     | tcg                          | 1.12.2-8.4.2-universal   | Pixelmon-1.12.2-8.4.2-universal.jar                | None                                     |
   | L     | placebo                      | 1.6.0                    | Placebo-1.12.2-1.6.0.jar                           | None                                     |
   | L     | portalgun                    | 7.1.0                    | Portal-Gun-Mod-1.12.2.jar                          | None                                     |
   | L     | prefab                       | 1.3.1.5                  | prefab-1.3.1.5.jar                                 | None                                     |
   | L     | reachfix                     | 1.0.6                    | ReachFix-1.12.2-1.0.6.jar                          | None                                     |
   | L     | searchablechests             | 1.12-1.5.3               | Searchable-Chests-Mod-Forge-1.12.2.jar             | None                                     |
   | L     | simplecore                   | 1.7.3.4                  | SimpleCore-API-1.12.2.jar                          | None                                     |
   | L     | simpleores                   | 1.11.2.2                 | SimpleOres-Mod-1.12.2.jar                          | None                                     |
   | L     | solargeneration              | 1.3.0                    | Solar-Generation-Mod-Forge-1.12.2.jar              | None                                     |
   | L     | swordblockingcombat          | 1.0.2                    | Sword-Blocking-Combat-Mod-1.12.2.jar               | None                                     |
   | L     | flying_things                | 1.5.3                    | The-Flying-Things-Mod-1.12.2.jar                   | None                                     |
   | L     | thercmod                     | 4.0.1.0                  | The-RC-Mod-1.12.2.jar                              | None                                     |
   | L     | tinkers_reforged             | 1.5.6                    | Tinkers-Reforged-Mod-1.12.2.jar                    | None                                     |
   | L     | treecapitator                | 1.43.0                   | TreeCapitator-Mod-1.12.2.jar                       | None                                     |
   | L     | unuparts                     | 5.1.4                    | UNU+Parts+Pack+[MTS]+1.12.2-22.5.0-V6-BETA2.jar    | None                                     |
   | L     | unucivil                     | 5.3.2                    | UNU+Civilian+Pack+[MTS]+1.12.2-22.5.0-V6-BETA2.jar | None                                     |
   | L     | vanillafix                   | 1.0.10-150               | VanillaFix-1.0.10-150.jar                          | None                                     |
   | L     | warpbook                     | 1.12.2-3.3.4             | Warp-Book-Mod-1.12.2.jar                           | None                                     |
   | L     | wings                        | 1.1.6                    | wings-1.1.6-1.12.2.jar                             | None                                     |
   | L     | bauble_wings                 | 1.0.0                    | wings-1.1.6-1.12.2.jar                             | None                                     |
   | L     | cgm                          | 0.15.3                   | Working-Gun-Mod-1.12.2.jar                         | None                                     |
   | L     | structurize                  | 1.12.2-0.10.277-RELEASE  | structurize-1.12.2-0.10.277-RELEASE.jar            | None                                     |
   | L     | minecolonies                 | 1.12.2-0.11.841-ALPHA    | minecolonies-1.12.2-0.11.841-BETA-universal.jar    | None                                     |
   | UD    | mowzies_wings                | 1.0.0                    | wings-1.1.6-1.12.2.jar                             | None                                     |
   | UD    | mobends_wings                | 1.0.0                    | wings-1.1.6-1.12.2.jar                             | None                                     |

Loaded coremods (and transformers): MicdoodlePlugin (MicdoodleCore-1.12.2.jar)
micdoodle8.mods.miccore.MicdoodleTransformer
wings (wings-1.1.6-1.12.2.jar)
me.paulf.wings.server.asm.WingsRuntimePatcher
me.paulf.wings.server.asm.mobends.WingsMoBendsRuntimePatcher
CQRPlugin (Chocolate_Quest_Repoured-1.12.2-2.6.12B.jar)
team.cqr.cqrepoured.asm.CQRClassTransformer
CreativePatchingLoader (CreativeCore-1.12.2.jar)

                                  ForgelinPlugin (Forgelin-1.8.4.jar)
                                    
                                  MekanismCoremod (Mekanism-1.12.2-9.8.3.390.jar)
                                    mekanism.coremod.KeybindingMigrationHelper
                                  AppleCore (AppleCore-mc1.12.2-3.4.0.jar)
                                    squeek.applecore.asm.TransformerModuleHandler
                                  iceandfire (Ice-and-Fire-Mod-1.12.2.jar)
                                    com.github.alexthe666.iceandfire.patcher.IceAndFireRuntimePatcher
                                  CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)
                                    team.chisel.ctm.client.asm.CTMTransformer
                                  ReachFixPlugin (ReachFix-1.12.2-1.0.6.jar)
                                    meldexun.reachfix.asm.ReachFixClassTransformer
                                  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
                                  VanillaFixLoadingPlugin (VanillaFix-1.0.10-150.jar)
                                    
                                  ObfuscatePlugin (Obfuscate-Mod-Forge-1.12.2.jar)
                                    com.mrcrayfish.obfuscate.asm.ObfuscateTransformer

AE2 Version: stable rv6-stable-7 for Forge 14.23.5.2768
Pulsar/tconstruct loaded Pulses: - TinkerCommons (Enabled/Forced)
- TinkerWorld (Enabled/Not Forced)
- TinkerTools (Enabled/Not Forced)
- TinkerHarvestTools (Enabled/Forced)
- TinkerMeleeWeapons (Enabled/Forced)
- TinkerRangedWeapons (Enabled/Forced)
- TinkerModifiers (Enabled/Forced)
- TinkerSmeltery (Enabled/Not Forced)
- TinkerGadgets (Enabled/Not Forced)
- TinkerOredict (Enabled/Forced)
- TinkerIntegration (Enabled/Forced)
- TinkerFluids (Enabled/Forced)
- TinkerMaterials (Enabled/Forced)
- TinkerModelRegister (Enabled/Forced)
- chiselIntegration (Enabled/Not Forced)
- chiselsandbitsIntegration (Enabled/Not Forced)
- wailaIntegration (Enabled/Not Forced)
Suspected Mods: Unknown
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to ‘fml,forge’
Type: Dedicated Server (map_server.txt)

You have a client side mod on your server. Sadly its not saying what the mod is bur it looks like your crash log has been cut off.

If you could follow the guidelines and post the entire log to a paste site such as pastebin and then send the link here. Hopefully that will tell us what mod is causing the issue

Already got it, I watched over it after dinner and then I thought: “Oh, Ex nihilo Omnia shows an error” and after i removed it, it showed me that mocreatures and treecapitator are the main problem.