Support & Bug Reports

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mousetweaks is a client-side-only mod Remove it from your server, keep it in your client   If there are further issues, add the new crash-report with sites like https://mclo.gs/ Maybe there are more client side mods

I recently used forge 1.7.10 to try and make a server for a custom modpack, but everytime I get to the point where I boot up the server I get his consistent error. I'm completely new to this so I tried remaking the server and mod folder a few times assuming a hard reset would fix it, it didn't. So I'm now looking for specific mods that might be the problem or if I'm missing a dependent or something. For the time being I have been looking for mods that might be causing this issue and I can't pinpoint as to what it might be. I have a hunch it has something to do with Ars Magica 2 because of the EntityClientPlayerMP but considering there are a bunch of magic mods I can't say for certain.  If anyone does think it's Ars Magica 2, is there any way to save the mod? I really don't want to have to lose it. Sorry in advance if the formatting for this post sucks, I didn't have a pastebin before making this. Crash Log: ---- Minecraft Crash Report ---- // Surprise! Haha. Well, this is awkward. Time: 1/9/25 5:46 AM Description: Exception in server tick loop cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP     at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)     at cpw.mods.fml.common.Loader.initializeMods(Loader.java:739)     at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)     at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:319)     at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:210)     at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)     at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityClientPlayerMP     at yalter.mousetweaks.loaders.MouseTweaksForge.init(Unknown Source)     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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)     at java.lang.reflect.Method.invoke(Unknown Source)     at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)     at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)     at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)     at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)     at com.google.common.eventbus.EventBus.post(EventBus.java:275)     at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)     at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)     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.EventSubscriber.handleEvent(EventSubscriber.java:74)     at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)     at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)     at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)     at com.google.common.eventbus.EventBus.post(EventBus.java:275)     at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)     at cpw.mods.fml.common.Loader.initializeMods(Loader.java:737)     ... 5 more Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityClientPlayerMP     at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)     at java.lang.ClassLoader.loadClass(Unknown Source)     at java.lang.ClassLoader.loadClass(Unknown Source)     ... 32 more Caused by: java.lang.ArrayIndexOutOfBoundsException 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 11 (amd64) version 10.0     Java Version: 1.8.0_431, Oracle Corporation     Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation     Memory: 3558558672 bytes (3393 MB) / 3946840064 bytes (3764 MB) up to 9544663040 bytes (9102 MB)     JVM Flags: 1 total; -Xmx10G     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 10.13.4.1614 103 mods loaded, 103 mods active     States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored     UCHI    mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)      UCHI    FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10-universal.jar)      UCHI    Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10-universal.jar)      UCHI    AM2-Preloader{0.0.3} [AMCore] (minecraft.jar)      UCHI    CodeChickenCore{1.0.7.48} [CodeChicken Core] (minecraft.jar)      UCHI    NotEnoughItems{1.0.5.120} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.120-universal.jar)      UCHI    ThaumicTinkerer-preloader{0.1} [Thaumic Tinkerer Core] (minecraft.jar)      UCHI    WitchingGadgetsCore{1.1.10} [Witching Gadgets Core] (minecraft.jar)      UCHI    OpenModsCore{0.10.1} [OpenModsCore] (minecraft.jar)      UCHI    <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)      UCHI    sapmanpack{2.7.2} [SanAndreasPs Manager Pack CORE edition] (SAPManPack-1.7.10-2.7.2.jar)      UCHI    FastCraft{1.25} [FastCraft] (fastcraft-1.25.jar)      UCHI    ExtendedPotions{1.2} [Extended Potions] (ExtendedPotions-MC1.7.10-1.2.jar)      UCHI    securitycraft{v1.8.13} [SecurityCraft] ([1.7.10] SecurityCraft v1.8.13.jar)      UCHI    AccidentallyCircumstantialEvents{1.12.11} [Accidentally Circumstantial Events] (accidentallycircumstantialevents-1.12.11.jar)      UCHI    Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)      UCHI    adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8c.jar)      UCHI    aether_legacy{v1.1.2.5} [The Aether] (aether-1.7.10-v1.1.2.5.jar)      UCHI    AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar)      UCHI    arsmagica2{1.4.0.009} [Ars Magica 2] (AM2-1.4.0.011-LE.jar)      UCHI    AM2PlantFix{1.0} [Ars Magica 2 Plant Fix] (AM2PlantFix-1.0.jar)      UCHI    AncientWarfare{3.0.1-beta-MC1.7.10} [Ancient Warfare Core] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    CoFHCore{1.7.10R3.1.4} [CoFH Core] (CoFHCore-[1.7.10]3.1.4-329.jar)      UCHI    AncientWarfareAutomation{3.0.1-beta-MC1.7.10} [Ancient Warfare Automation] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    AncientWarfareModeler{3.0.1-beta-MC1.7.10} [Ancient Warfare Model Editor] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    AncientWarfareStructure{3.0.1-beta-MC1.7.10} [Ancient Warfare Structures] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    AncientWarfareNEIPlugin{3.0.1-beta-MC1.7.10} [Ancient Warfare NEI Plugin] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    AncientWarfareNpc{3.0.1-beta-MC1.7.10} [Ancient Warfare NPCs] (ancientwarfare-3.0.1-beta-MC1.7.10-FULL.jar)      UCHI    antiqueatlas{4.4.4} [Antique Atlas] (antiqueatlas-1.7.10-4.4.4.jar)      UCHI    AppleCore{3.1.1} [AppleCore] (AppleCore-mc1.7.10-3.1.1.jar)      UCHI    ArchimedesShips{1.7.10 v1.7.1} [Archimedes' Ships] (ArchimedesShips-1.7.1.jar)      UCHI    ATG{0.10.0} [Alternate Terrain Generation] (ATG-1.7.10-0.12.0.jar)      UCHI    aura{unspecified} [Aura Cascade] (AuraCascade-557.jar)      UCHI    Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5.jar)      UCHI    Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)      UCHI    Automagy{0.28.2} [Automagy] (Automagy-1.7.10-0.28.2.jar)      UCHI    BiblioCraft{1.11.7} [BiblioCraft] (BiblioCraft[v1.11.7][MC1.7.10].jar)      UCHI    BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1889-universal.jar)      UCHI    bleach_kd{1.4.6} [LittleBreadLoaf's Bleach Mod] (Bleach_KD-1.4.6-1.7.10.jar)      UCHI    AWWayofTime{v1.3.3} [Blood Magic: Alchemical Wizardry] (BloodMagic-1.7.10-1.3.3-17.jar)      UCHI    Botania{r1.8-249} [Botania] (Botania r1.8-249.jar)      UCHI    TwilightForest{2.4.3} [The Twilight Forest] (TwilightForest-2.4.3.jar)      UCHI    chisel{2.5.1.44} [Chisel 2] (Chisel2-2.5.1.44.jar)      UCHI    CarpentersBlocks{3.3.8.2} [Carpenter's Blocks] (Carpenter's Blocks v3.3.8.2 - MC 1.7.10.jar)      UCHI    chococraft{4.1.5} [Clienthax's ChocoCraft] (ChocoCraft-4.1.5.jar)      UCHI    claysoldiers{2.0.0-beta.2} [Clay Soldiers Mod] (ClaySoldiersMod-1.7.10-2.0.0-beta.2.jar)      UCHI    cosmeticarmorreworked{1.7.10-v7} [CosmeticArmorReworked] (CosmeticArmorReworked-1.7.10-v7.jar)      UCHI    CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip)      UCHI    customnpcs{1.7.10d} [CustomNpcs] (CustomNPCs_1.7.10d(29oct17).jar)      UCHI    menagerie{1.0} [menagerie] (dark_menagerie-1.7.10-beta-3.1a.jar)      UCHI    DisenchanterMod{1.6} [Disenchanter] (DisenchanterMod-[1.7.10]1.6.jar)      UCHI    DragonMounts{r41-1.7.10} [Dragon Mounts] (DragonMounts-r41-1.7.10.jar)      UCHI    MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip)      UCHI    ThaumicTinkerer{unspecified} [Thaumic Tinkerer] (ThaumicTinkerer-2.5-1.7.10-164.jar)      UCHI    ForbiddenMagic{1.7.10-0.575} [Forbidden Magic] (Forbidden Magic-1.7.10-0.575.jar)      UCHI    MineTweaker3{3.0.10} [MineTweaker 3] (MineTweaker3-1.7.10-3.0.10B.jar)      UCHI    FTBL{1.0.18.2} [FTBLib] (FTBLib-1.7.10-1.0.18.3.jar)      UCHI    FTBU{1.0.18.2} [FTBUtilities] (FTBUtilities-1.7.10-1.0.18.3.jar)      UCHI    gadomancy{1.0.7.3} [Gadomancy] (gadomancy-1.7.10-1.0.7.3.jar)      UCHI    gravestone{0.7.10.3} [Gravestone] (GraveStone Mod 0.7.10.3.jar)      UCHI    GrimoireOfGaia{1.0.0} [Grimoire of Gaia 3] (GrimoireOfGaia3-1.7.10-1.2.7.jar)      UCHI    guideapi{1.7.10-1.0.1-20} [Guide-API] (Guide-API-1.7.10-1.0.1-20.jar)      UCHI    HardcoreQuesting{4.4.4} [Hardcore Questing Mode] (HQM-The Journey-4.4.4.jar)      UCHI    ImLookingAtBlood{1.1} [I'm Looking At Blood] (ImLookingAtBlood-1.7.2-1.1a.jar)      UCHI    inventorytweaks{1.59-dev-152-cf6e263} [Inventory Tweaks] (InventoryTweaks-1.59-dev-152.jar)      UCHI    IronChest{6.0.62.742} [Iron Chest] (ironchest-1.7.10-6.0.62.742-universal.jar)      UCHI    JABBA{1.2.2} [JABBA] (Jabba-1.2.2_1.7.10.jar)      UCHI    launchgui{1.7.10-2.0-18} [LaunchGUI] (LaunchGui-1.7.10-2.0-18-client.jar)      UCHI    magicalcrops{4.0.0_PUBLIC_BETA_4b} [Magical Crops: Core] (magicalcrops-4.0.0_PUBLIC_BETA_5.jar)      UCHI    magicalcropsarmour{4.0.0_PUBLIC_BETA_4} [Magical Crops: Armoury] (magicalcropsarmoury-4.0.0_PUBLIC_BETA_4.jar)      UCHI    RadixCore{2.1.3} [RadixCore] (RadixCore-1.7.10-2.1.3-universal.jar)      UCHI    MCA{1.7.10-5.2.2} [Minecraft Comes Alive] (MCA-1.7.10-5.2.2-universal.jar)      UCHI    modtweaker2{0.9.6} [Mod Tweaker 2] (ModTweaker2-0.9.6.jar)      UCHI    Morpheus{1.7.10-1.6.21} [Morpheus] (Morpheus-1.7.10-1.6.21.jar)      UCHE    MouseTweaks{2.4.4} [Mouse Tweaks] (MouseTweaks-2.4.4-mc1.7.10.jar)      UCHI    cfm{3.4.7} [ 9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar)      UCHI    Mystcraft{0.12.3.04} [Mystcraft] (mystcraft-1.7.10-0.12.3.04.jar)      UCHI    netherportalfix{1.0} [Nether Portal Fix] (netherportalfix-mc1.7.10-1.1.0.jar)      UCHI    OpenMods{0.10.1} [OpenMods] (OpenModsLib-1.7.10-0.10.1.jar)      UCHI    OpenBlocks{1.6} [OpenBlocks] (OpenBlocks-1.7.10-1.6.jar)      UCHI    clayspawn{1.7.10b} [Pam's Clayspawn] (Pam's Clay Spawn 1.7.10b.jar)      UCHI    harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10Lb.jar)      UCHI    Quadrum{1.2.0} [Quadrum] (Quadrum-1.7.10-1.2.0.B13-universal.jar)      UCHI    Roguelike{1.5.0} [Roguelike Dungeons] (roguelike-1.7.10-1.5.0b.jar)      UCHI    Sanguimancy{1.7.10-1.1.9-35} [Sanguimancy] (Sanguimancy-1.7.10-1.1.9-35.jar)      UCHI    StorageDrawers{1.7.10-1.10.9} [Storage Drawers] (StorageDrawers-1.7.10-1.10.9.jar)      UCHI    TCBotaniaExoflame{1.0} [TCBotaniaExoflame] (TCBotaniaExoflame-1.7.10-1.4.jar)      UCHI    tcinventoryscan{1.0.11} [TC Inventory Scanning] (tcinventoryscan-mc1.7.10-1.0.11.jar)      UCHI    tcnodetracker{1.1.2} [TC Node Tracker] (tcnodetracker-1.7.10-1.1.2.jar)      UCHI    thaumcraftneiplugin{@VERSION@} [Thaumcraft NEI Plugin] (thaumcraftneiplugin-1.7.10-1.7a.jar)      UCHI    thaumicdyes{1.10.5} [Thaumic Dyes] (Thaumic-Dyes-[1.7.10] 1.10.5-0.jar)      UCHI    ThaumicExploration{0.6.0} [Thaumic Exploration] (ThaumicExploration-1.7.10-1.1-53.jar)      UCHI    ThaumicHorizons{1.7.0} [ThaumicHorizons] (ThaumicHorizons-1.7.0.jar)      UCHI    thaumicinfusion{4.32} [Thaumic Infusion] (ThaumicInfusion-4.32.jar)      UCHI    TravellersGear{1.16.6} [Traveller's Gear] (TravellersGear-1.7.10-1.16.6.jar)      UCHI    wawla{1.3.1} [What Are We Looking At] (Wawla-1.0.5.120.jar)      UCHI    waystones{1.0.12} [Waystones] (Waystones-mc1.7.10-1.0.12.jar)      UCHI    weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.jar)      UCHI    witchery{0.24.1} [Witchery] (witchery-1.7.10-0.24.1.jar)      UCHI    WitchingGadgets{1.1.10} [Witching Gadgets] (WitchingGadgets-1.7.10-1.1.10.jar)      UCHI    wolfarmor{1.3.0} [Wolf Armor and Storage] (wolfarmor-1.3.0.1.jar)      UCHI    yampst{1.3.5} [YAMPST] (Yampst-Simply Magic-1.0.0.jar)      UCHI    aobd{2.9.2} [Another One Bites The Dust] (AOBD-2.9.2.jar)      OpenModsLib class transformers: [stencil_patches:ENABLED],[movement_callback:ENABLED],[player_damage_hook:FINISHED],[map_gen_fix:FINISHED],[gl_capabilities_hook:ENABLED],[player_render_hook:ENABLED]     Class transformer null safety: found misbehaving transformers: me.guichaguri.betterfps.transformers.MathTransformer(me.guichaguri.betterfps.transformers.MathTransformer@25032123) returned non-null result: 0,me.guichaguri.betterfps.transformers.EventTransformer(me.guichaguri.betterfps.transformers.EventTransformer@c2bfe72) returned non-null result: 0     CoFHCore: -[1.7.10]3.1.4-329     Profiler Position: N/A (disabled)     Is Modded: Definitely; Server brand changed to 'fml,forge'     Type: Dedicated Server (map_server.txt)

I'm saving and storing the position at a different point.  I know it's accurate in my testing cases because I'm also displaying the entity's coordinates, and if I manually teleport to them I can verify the entity is there.