Minecraft Forums

Hey doods!

I just recently cleaned my pc and backup some important things that were going to be deleted, but I had to reinstall the Minecraft Launcher. I went through my normal process, reinstall the launcher, download java, forge, and optifine with no problem. It runs well without the mods I want, but when I add the mods, it crashes and this comes up:

---- Minecraft Crash Report ----
// Why is it breaking

Time: 10/4/15 11:16 PM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: Lnet/minecraftforge/common/Property;
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:544)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:208)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: Lnet/minecraftforge/common/Property;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2575)
at java.lang.Class.getDeclaredField(Class.java:2060)
at cpw.mods.fml.common.FMLModContainer.parseSimpleFieldAnnotation(FMLModContainer.java:404)
at cpw.mods.fml.common.FMLModContainer.processFieldAnnotations(FMLModContainer.java:358)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:513)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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.loadMods(Loader.java:513)
... 10 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.Property
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 37 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 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 133787288 bytes (127 MB) / 403681280 bytes (384 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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 10.13.4.1517 Optifine OptiFine_1.7.10_HD_U_C1 85 mods loaded, 85 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UC mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UC FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1517-1.7.10.jar)
UC Forge{10.13.4.1517} [Minecraft Forge] (forge-1.7.10-10.13.4.1517-1.7.10.jar)
UC appliedenergistics2-core{rv2-stable-10} [AppliedEnergistics2 Core] (minecraft.jar)
UC CodeChickenCore{1.0.7.46} [CodeChicken Core] (minecraft.jar)
UC ImmibisMicroblocks{59.0.0} [Immibis's Microblocks] (Immibiss-Microblocks-Mod-1.7.10.jar)
UC ivtoolkit{IvToolkit} [1.1] (minecraft.jar)
UC NotEnoughItems{1.0.5.111} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.111-universal.jar)
UC VeinMiner_coremod{0.21.2_build-43} [Core mod] (minecraft.jar)
UC OpenModsCore{0.8} [OpenModsCore] (minecraft.jar)
UC <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UC lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar)
UC CoFHCore{1.7.10R3.0.3} [CoFH Core] (CoFHCore-[1.7.10]3.0.3-303.jar)
UC BuildCraft|Core{7.0.17} [BuildCraft] (buildcraft-7.0.17.jar)
UC BuildCraft|Factory{7.0.17} [BC Factory] (buildcraft-7.0.17.jar)
UC BuildCraft|Energy{7.0.17} [BC Energy] (buildcraft-7.0.17.jar)
UC BuildCraft|Silicon{7.0.17} [BC Silicon] (buildcraft-7.0.17.jar)
UC BuildCraft|Builders{7.0.17} [BC Builders] (buildcraft-7.0.17.jar)
UC BuildCraft|Transport{7.0.17} [BC Transport] (buildcraft-7.0.17.jar)
UC Additional-Buildcraft-Objects{MC1.7.10-BC7release3.0.1} [Additional Buildcraft Objects] (ABO-MC1.7.10-BC7-release3.0.1.jar)
UC Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UC adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8b.jar)
UC appliedenergistics2{rv2-stable-10} [Applied Energistics 2] (appliedenergistics2-rv2-stable-10.jar)
UC hud{1.1a} [Better HUD] (Better HUD by NukeDuck [1.7.10][1.1a].zip)
UC BiblioCraft{1.8.2} [BiblioCraft] (BiblioCraft-Mod-1.7.10.jar)
UC Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar)
UC Natura{2.2.0} [Natura] (natura-1.7.10-2.2.0.1.jar)
UC BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1067-universal.jar)
UC CarpentersBlocks{3.3.6} [Carpenter's Blocks] (Carpenter's Blocks v3.3.6 - MC 1.7.10.jar)
UC Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5.jar)
UC TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.jar)
UC chisel{2.5.0.43} [Chisel 2] (Chisel2-2.5.0.43.jar)
UC cgo{@[email protected]} [CG Origin] (CountryGamer-Core-1.7.10.jar)
UC craftguide{1.6.8.2} [CraftGuide] (CraftGuide-1.6.8.2-forge.jar)
UC DamageIndicatorsMod{3.2.0} [Damage Indicators] (Damage-Indicators-Mod-1.7.10.jar)
UC elementalcreepers{4.3.0} [Elemental Creepers] (Elemental Creepers-universal_1.7.10-4.3.0.jar)
UC ThermalFoundation{1.7.10R1.2.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.0-102.jar)
UC ExtraUtilities{1.1.0k} [Extra Utilities] (Extra-Utilities-Mod-1.7.10.jar)
UC ExtrabiomesXL{3.16.2} [ExtrabiomesXL] (extrabiomesxl_1.7.10-3.16.2.jar)
UC farlanders{1.2b} [The Farlanders] (farlanders-1.7.10-v1.2b.jar)
UC FortuneOres{2.0.5} [FortuneOres] (FortuneOres-MC1.7.10-2.0.5.jar)
UC iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UC Hats{4.0.0} [Hats] (Hats-Mod-1.7.10.jar)
UC headcrumbs{1.2.5} [Headcrumbs] (Headcrumbs-1.2.5.jar)
UC IC2{2.2.727-experimental} [IndustrialCraft 2] (industrialcraft-2-2.2.727-experimental.jar)
UC ImmibisCore{59.0.1} [Immibis Core] (Immibis-Core-1.7.10.jar)
UC InfernalMobs{1.6.0} [Infernal Mobs] (InfernalMobs-1.7.10.jar)
UC InventoryPets{1.1.0} [Inventory Pets] (inventorypets-1.7.10-1.1.0.jar)
UC IronChest{6.0.60.741} [Iron Chest] (Iron-Chests-Mod-1.7.10.jar)
UC Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UC JABBA{1.2.1} [JABBA] (Jabba-1.2.1a_1.7.10.jar)
UC lootbags{1.8.1} [Loot Bags] (LootBags-1.7.10-1.8.1.jar)
UC magicalcrops{4.0.0_PUBLIC_BETA_3} [Magical Crops] (magicalcrops-4.0.0_PUBLIC_BETA_3.jar)
UC malisiscore{1.7.10-0.12.9} [MalisisCore] (malisiscore-1.7.10-0.12.9.jar)
UC malisisdoors{1.7.10-1.10} [Malisis' Doors] (malisisdoors-1.7.10-1.10.jar)
UC mam{1.7.10-1.0.2} [Myths & Monsters Mod] (mam-1.7.10-1.0.2.jar)
UC mobdropores{mc1.7.10-v1.1} [Mob Drop Ores] (Mob-Drop-Ores-Mod-1.7.10.jar)
UC modularpots{1.7.10.14} [Modular Flower Pots] (ModularPots-1.7.10.14.jar)
UC MFQM{1.0.5.1} [More Fun Quicksand Mod] (More-Fun-Quicksand-Mod-1.7.10.jar)
UC cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar)
UC musica{1.1.0} [Musica] (Musica-1.1.0-MC1.7.10.jar)
UC OpenMods{0.8} [OpenMods] (OpenModsLib-1.7.10-0.8.jar)
UC OpenBlocks{1.4.4} [OpenBlocks] (OpenBlocks-1.7.10-1.4.4.jar)
UC OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3 (1).zip)
UC pandorasbox{2.0.1} [Pandora's Box] (Pandoras-Box-Mod-1.7.10.jar)
UC PortalGun{4.0.0-beta-5} [PortalGun] (Portal-Gun-Mod-1.7.10.jar)
UE Prometheus{0.5.0} [Prometheus] (Prometheus.jar)
UC ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar)
UC secretroomsmod{@[email protected]} [The SecretRoomsMod] (Secret-Rooms-Mod-1.7.10.jar)
UC ThermalExpansion{1.7.10R4.0.3B1} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.3B1-218.jar)
UC zeldaswordskills{1.7.10-beta-0.1.4} [Zelda Sword Skills] (Zelda-Sword-Skills-Mod-1.7.10.jar)
UC TConstruct{1.7.10-1.8.5.build957} [Tinkers' Construct] (TConstruct-1.7.10-1.8.5.jar)
UC ThermalDynamics{1.7.10R1.1.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.1.0-161.jar)
UC TwoGraves{1710.1.0} [Graves] (TwoGraves-Mod-1.7.10.jar)
UC VeinMiner{0.21.2} [Vein Miner] (VeinMiner-1.7.10_0.21.2.43.jar)
UC VeinMinerModSupport{0.21.2} [Mod Support] (VeinMiner-1.7.10_0.21.2.43.jar)
UE VillageMods{1.2c} [Village Mods] (VillageMods,VillageBiomes,VillageDensity.jar)
UE VillageBiomes{1.2c} [Village Biomes] (VillageMods,VillageBiomes,VillageDensity.jar)
UE VillageDensity{1.2} [Village Density] (VillageMods,VillageBiomes,VillageDensity.jar)
UC weepingangels{@[email protected]} [Weeping Angels] (Weeping-Angels-Mod-1.7.10.jar)
UC youtubers{1.7.1} [Youtubers+ Mod] (youtubers-1.7.1-MC1.7.10.jar)
UC BuildCraft|Robotics{7.0.17} [BC Robotics] (buildcraft-7.0.17.jar)
UC thebombzenapi{2.4.2} [ThebombzenAPI] (ThebombzenAPI-v2.4.2-mc1.7.10.jar)
UC enchantview{4.1.0} [EnchantView] (EnchantView-v4.1.0-mc1.7.10.jar)
UC IguanaTweaksTConstruct{1.7.10-2.1.5.140} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.5.jar)
GL info: ' Vendor: 'Intel' Version: '4.0.0 - Build 10.18.10.3925' Renderer: 'Intel(R) HD Graphics'
OpenModsLib class transformers: [stencil_patches:FINISHED],[movement_callback:FINISHED],[map_gen_fix:ENABLED],[gl_capabilities_hook:FINISHED],[player_render_hook:ENABLED]
Class transformer null safety: all safe
CoFHCore: -[1.7.10]3.0.3-303
AE2 Version: stable rv2-stable-10 for Forge 10.13.2.1291
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
ThermalFoundation: -[1.7.10]1.2.0-102
ThermalExpansion: -[1.7.10]4.0.3B1-218
TConstruct Environment: Environment healthy.
ThermalDynamics: -[1.7.10]1.1.0-161

---------------

I'm not use to the modded world, or the crash report- so I don't really understand the problem at hand. Does anyone know what the problem is? All help is very much appreciated, thank you

Thanks so much for answering! I checkwd it out and it was the Prometheus and Village Density mods- they were corrupting my installation. :/ I guess they were outdated or something. But thank you, your awesome have a rad day!