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I'm using Rexxit: Jurassic Pack modpack and this is the crash report:

---- Minecraft Crash Report ----
// Don't do that.

Time: 3/8/16 11:06 PM
Description: Initializing game

java.lang.NullPointerException: Initializing game
at net.ilexiconn.llibrary.common.update.VersionHandler.searchForOutdatedModsInefficiently(VersionHandler.java:23)
at net.ilexiconn.llibrary.common.update.VersionHandler.searchForOutdatedMods(VersionHandler.java:34)
at net.ilexiconn.llibrary.common.ServerProxy.postInit(ServerProxy.java:30)
at net.ilexiconn.llibrary.client.ClientProxy.postInit(ClientProxy.java:58)
at net.ilexiconn.llibrary.LLibrary.postInit(LLibrary.java:63)
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.GeneratedMethodAccessor5.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:742)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at net.ilexiconn.llibrary.common.update.VersionHandler.searchForOutdatedModsInefficiently(VersionHandler.java:23)
at net.ilexiconn.llibrary.common.update.VersionHandler.searchForOutdatedMods(VersionHandler.java:34)
at net.ilexiconn.llibrary.common.ServerProxy.postInit(ServerProxy.java:30)
at net.ilexiconn.llibrary.client.ClientProxy.postInit(ClientProxy.java:58)
at net.ilexiconn.llibrary.LLibrary.postInit(LLibrary.java:63)
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.GeneratedMethodAccessor5.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:742)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)

-- Initialization --
Details:
Stacktrace:
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 107343896 bytes (102 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -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 10.13.4.1614 Optifine OptiFine_1.7.10_HD_U_C1 93 mods loaded, 93 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJ mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJ FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJ Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar)
UCHIJ appliedenergistics2-core{rv2-stable-10} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJ CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJ ivtoolkit{IvToolkit} [1.2] (minecraft.jar)
UCHIJ NotEnoughItems{1.0.5.118} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.118-universal.jar)
UCHIJ OpenComputers|Core{1.5.19.37} [OpenComputers (Core)] (minecraft.jar)
UCHIJ <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UCHIJ betterloadingscreen{1.3.8} [Better Loading Screen] ([1.7.10] BetterLoadingScreen-em-1.3.8.jar)
UCHIJ securitycraft{v1.8.0} [SecurityCraft] ([1.7.10] SecurityCraft v1.8.0.jar)
UCHIJ bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar)
UCHIJ StartingInventory{1.7.10.r03} [StartingInventory] ([1.7.10]StartingInventory-universal-1.7.10.r03.jar)
UCHIJ Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar)
UCHIJ CoFHCore{1.7.10R3.0.3} [CoFH Core] (CoFHCore-[1.7.10]3.0.3-303.jar)
UCHIJ advancedgenetics{1.5.9} [Advanced Genetics] (advancedgenetics-1.7.10-1.5.9.jar)
UCHIJ appliedenergistics2{rv2-stable-10} [Applied Energistics 2] (appliedenergistics2-rv2-stable-10.jar)
UCHIJ iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJ BackTools{4.0.0} [BackTools] (BackTools-4.0.0-client.jar)
UCHIJ betterrecords{@[email protected]} [Better Records] (BetterRecords-1.7.10-1.2.0.jar)
UCHIJ betterstorage{0.13.1.126} [BetterStorage] (BetterStorage-1.7.10-0.13.1.126.jar)
UCHIJ BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1462-universal.jar)
UCHIJ CarpentersBlocks{3.3.7} [Carpenter's Blocks] (Carpenter's Blocks v3.3.7 - MC 1.7.10.jar)
UCHIJ ForgeMultipart{1.2.0.345} [Forge Multipart] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UCHIJ chisel{2.9.2.8} [Chisel] (Chisel-2.9.2.8.jar)
UCHIJ CustomMainMenu{1.8} [Custom Main Menu] (CustomMainMenu-MC1.7.10-1.8-client.jar)
UCHIJ lootablebodies{1.3.6} [DrCyano's Lootable Bodies] (CyanosLootableBodies-1.7.10-backport_1.3.6.jar)
UCHIJ defaultworldgenerator{0.1-b13} [Default World Generator] (DefaultWorldGenerator-1.7.10-0.1-b13-client.jar)
UCHIJ DynamicLights{1.3.9} [Dynamic Lights] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_onFire{1.0.5} [Dynamic Lights Burning Entity Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_dropItems{1.0.8} [Dynamic Lights EntityItem Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_mobEquipment{1.0.8} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_floodLights{1.0.2} [Dynamic Lights Flood Light] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_otherPlayers{1.0.8} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.10-client.jar)
UCHIJ DynamicLights_thePlayer{1.1.4} [Dynamic Lights Player Light Module] (DynamicLights-1.7.10-client.jar)
UCHIJ eplus{3.0.2-d} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.2-d.jar)
UCHIJ ThermalFoundation{1.7.10R1.2.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.0-102.jar)
UCHIJ ExtraUtilities{1.2.11} [Extra Utilities] (extrautilities-1.2.11.jar)
UCHIJ farseek{1.0.10} [Farseek] (Farseek-1.0.10.jar)
UCHIJ FastCraft{1.21} [FastCraft] (fastcraft-1.21.jar)
UCHIJ flansmod{4.10.0} [Flan's Mod] (Flans Mod-1.7.10-4.10.0.jar)
UCHIJ McMultipart{1.2.0.345} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UCHIJ Hats{4.0.1} [Hats] (Hats-4.0.1.jar)
UCHIJ HatStand{4.0.0} [HatStand] (HatStand-4.0.0.jar)
UCHIJ inventorytweaks{1.59-dev-156-af3bc68} [Inventory Tweaks] (InventoryTweaks-1.59-dev-156.jar)
UCHIJ Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJ JABBA{1.2.1} [JABBA] (Jabba-1.2.1a_1.7.10.jar)
UCHIJ jcanimation{1.2.4} [JCAnimationAPI] (JurassiCraft-1.4.5.jar)
UCHIE llibrary{0.4.3} [LLibrary] (llibrary-0.4.3-1.7.10.jar)
UCHIE jurassicraft{1.4.5} [JurassiCraft] (JurassiCraft-1.4.5.jar)
UCHIJ LunatriusCore{1.1.2.21} [LunatriusCore] (LunatriusCore-1.7.10-1.1.2.21-universal.jar)
UCHIJ malisiscore{1.7.10-0.12.9} [MalisisCore] (malisiscore-1.7.10-0.12.9.jar)
UCHIJ malisisdoors{1.7.10-1.9.5} [Malisis' Doors] (malisisdoors-1.7.10-1.9.5.jar)
UCHIJ Mantle{1.7.10-0.3.2.jenkins188} [Mantle] (Mantle-1.7.10-0.3.2a.jar)
UCHIJ Mekanism{8.1.7} [Mekanism] (Mekanism-1.7.10-8.1.7.252.jar)
UCHIJ MekanismGenerators{8.1.7} [MekanismGenerators] (MekanismGenerators-1.7.10-8.1.7.252.jar)
UCHIJ MekanismTools{8.1.7} [MekanismTools] (MekanismTools-1.7.10-8.1.7.252.jar)
UCHIJ MineMenu{1.2.0} [MineMenu] (MineMenu-1.7.10-1.2.0.B44-universal-client.jar)
UCHIJ MineTweaker3{3.0.10} [MineTweaker 3] (MineTweaker3-1.7.10-3.0.10B.jar)
UCHIJ MTRM{1.0} [MineTweakerRecipeMaker] (MineTweakerRecipeMaker-1.7.10-1.1.0.11.jar)
UCHIJ numina{0.4.0.131} [Numina] (Numina-0.4.0.131.jar)
UCHIJ powersuits{0.11.0.283} [MachineMuse's Modular Powersuits] (ModularPowersuits-0.11.0.283.jar)
UCHIJ MouseTweaks{2.4.4} [Mouse Tweaks] (MouseTweaks-2.4.4-mc1.7.10-client.jar)
UCHIJ NetherOres{1.7.10R2.3.0} [Nether Ores] (NetherOres-[1.7.10]2.3.0-12.jar)
UCHIJ ThermalExpansion{1.7.10R4.0.3B1} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.3B1-218.jar)
UCHIJ OpenComputers{1.5.19.37} [OpenComputers] (OpenComputers-MC1.7.10-1.5.19.37-universal.jar)
UCHIJ openmodularturrets{2.1.5-184} [Open Modular Turrets] (OpenModularTurrets-1.7.10-2.1.5-184.jar)
UCHIJ harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10k.jar)
UCHIJ Ping{%MOD_VERSION} [Ping] (Ping-1.7.X-1.0.2.B6-universal.jar)
UCHIJ reccomplex{0.9.6.3} [Recurrent Complex] (RecurrentComplex-0.9.6.3.jar)
UCHIJ RedstonePasteMod{1.6.2} [Redstone Paste] (RedstonePasteMod-1.7.10-1.6.2.jar)
UCHIJ ResourceLoader{1.2} [Resource Loader] (ResourceLoader-1.2-client.jar)
UCHIJ Schematica{1.7.6.125} [Schematica] (Schematica-1.7.10-1.7.6.125-universal.jar)
UCHIJ Shatter{4.0.0} [Shatter] (Shatter-4.0.0-client.jar)
UCHIJ Stackie{1.6.0.36} [Stackie] (Stackie-1.7.10-1.6.0.36-universal.jar)
UCHIJ streams{0.1.6} [Streams] (Streams-0.1.6.jar)
UCHIJ supercraftingframe{1.7.10.3} [Super Crafting Frame] (supercraftingframe-1.7.10.3.jar)
UCHIJ Sync{4.0.0} [Sync] (Sync-4.0.0.jar)
UCHIJ tabbychat{1.11.2.2} [TabbyChat] (TabbyChat-1.7.10-1.11.2.2-fml-client.jar)
UCHIJ TConstruct{1.7.10-1.8.7.build979} [Tinkers' Construct] (TConstruct-1.7.10-1.8.7.jar)
UCHIJ ThermalDynamics{1.7.10R1.1.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.1.0-161.jar)
UCHIJ TiCTooltips{1.2.5} [TiC Tooltips] (TiCTooltips-mc1.7.10-1.2.5-client.jar)
UCHIJ TMechworks{0.2.14.100} [Tinkers' Mechworks] (TMechworks-1.7.10-0.2.14.100.jar)
UCHIJ tradeboothmod{1.7.10.1} [Trade Booth Mod] (tradebooth.1.7.10.1.jar)
UCHIJ WR-CBE|Core{1.4.1.9} [WR-CBE Core] (WR-CBE-1.7.10-1.4.1.9-universal.jar)
UCHIJ WR-CBE|Addons{1.4.1.9} [WR-CBE Addons] (WR-CBE-1.7.10-1.4.1.9-universal.jar)
UCHIJ WR-CBE|Logic{1.4.1.9} [WR-CBE Logic] (WR-CBE-1.7.10-1.4.1.9-universal.jar)
UCHIJ aobd{2.8.4} [Another One Bites The Dust] (AOBD-2.8.4.jar)
UCHIJ ForgeMicroblock{1.2.0.345} [Forge Microblocks] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UCHIJ IguanaTweaksTConstruct{1.7.10-2.1.5.140} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.5.jar)
CoFHCore: -[1.7.10]3.0.3-303
AE2 Version: stable rv2-stable-10 for Forge 10.13.2.1291
ThermalFoundation: -[1.7.10]1.2.0-102
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
NetherOres: -[1.7.10]2.3.0-12
ThermalExpansion: -[1.7.10]4.0.3B1-218
TConstruct Environment: Environment healthy.
ThermalDynamics: -[1.7.10]1.1.0-161
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BC:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:ON, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:ON, NEI:ON, CraftGuide:OFF, Mekanism:ON, ImmibisMicroblocks:OFF, BetterStorage:ON
Launched Version: 1.7.10-Forge10.13.4.1614-1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) G45/G43 Express Chipset GL version 2.1.0 - Build 8.15.10.2555, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because EXT_framebuffer_object is supported.
Anisotropic filtering is supported and maximum anisotropy is 2.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Do you have a good enough CPU or enough RAM power to launch this modpack?

I am gonna test it out but it looks like you should increase amount of ram you have allocated.

--Edit--

I confirmed that the issue is not caused by lack of ram (though using half a gb for running a modpack is not advised...)

It might be something with Llibrary. It might be outdated or something else, like missing a core mod. Try to use v1.14 and see if that works

It's working! but there aren't any "single player" button, the screen is black and i can hear the minecraft music...

I've watched others youtubers played this modpack, nothing happened to their games. I thing i'll delete some mods...

Quote from TheDynoFoss»

I've watched others youtubers played this modpack, nothing happened to their games, why me?

Reinstall the modpack and then try again. That's my suggestion at the moment.

Looking through the technic mod pack page I see that the same problem was happening at least a month ago. I know that it is a problem with jurassicraft and llibrary but the only fix I know of is to remove the two mods.

What is Java 7/8 64 bit? I just know that i've java 8 update 73 and I'm using Windows 7 32-bit. I couldn't play minecraft anymore with this modpack. I just want to update my Win 7 32-bit to 64-bit.

Quote from TheDynoFoss»

What is Java 7/8 64 bit? I just know that i've java 8 update 73 and I'm using Windows 7 32-bit. I couldn't play minecraft anymore with this modpack. I just want to update my Win 7 32-bit to 64-bit

I don't think you can do that without having to do a clean update to Windows 7 64-bit?

Quote from ImmuneAndElitenext

I don't think you can do that without having to do a clean update to Windows 7 64-bit?

It depends on the specs of your computer. If you have 32 bit windows then you likely can't run 64 bit (Unless you weren't paying attention and bought the wrong windows).

Well, i've deleted more than 20 mods, it's working now, but...