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The minecraft forum does support any version (in relativity). You may not get the best response as on this forum, so I would recommend updating to 1.8 or higher.

Hello everyone! I am trying to start up a modpack that I made and I keep getting this error (over and over again). I tried uninstalling and reinstalling forge, and it did not work. Below is the log: Thanks for helping,

Hello everyone, I have this error on the minecraft launcher: My crash log is : Please help me, and I greatly appreciate any help or comment!

I've tried that, 8 hours. Seen other people reply to threads posted after me, so I thought I'd try here.

Why is that? Do you know any way forums that do support 1.6.4?

Hello Everyone! I am trying to make a mudpack with *about* 100 mods, my computer is very capable with 1TB of storage and 4GB of RAM. Here's the error I get on the launcher: Crash report: ---- Minecraft Crash Report ---- // Sorry Time: 9/2/18 12:06 PM Description: Initializing game java.lang.NoClassDefFoundError: net/minecraft/block/BlockSlab at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462) 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:497) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296) at com.google.common.eventbus.EventBus.post(EventBus.java:267) at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201) at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181) 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:497) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296) at com.google.common.eventbus.EventBus.post(EventBus.java:267) at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112) at cpw.mods.fml.common.Loader.loadMods(Loader.java:511) at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808) at net.minecraft.client.main.Main.main(SourceFile:101) 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:497) at net.minecraft.launchwrapper.Launch.launch(Launch.java:131) at net.minecraft.launchwrapper.Launch.main(Launch.java:27) Caused by: java.lang.ClassNotFoundException: net.minecraft.block.BlockSlab at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 35 more Caused by: java.lang.NullPointerException at org.objectweb.asm.ClassReader.<init>(Unknown Source) at invtweaks.forge.asm.ContainerTransformer.transform(ContainerTransformer.java:116) at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274) at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172) ... 37 more A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Stacktrace: at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:348) at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462) 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:497) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296) at com.google.common.eventbus.EventBus.post(EventBus.java:267) at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201) at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181) 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:497) at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74) at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296) at com.google.common.eventbus.EventBus.post(EventBus.java:267) at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112) at cpw.mods.fml.common.Loader.loadMods(Loader.java:511) at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473) -- Initialization -- Details: Stacktrace: at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808) at net.minecraft.client.main.Main.main(SourceFile:101) 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:497) at net.minecraft.launchwrapper.Launch.launch(Launch.java:131) at net.minecraft.launchwrapper.Launch.main(Launch.java:27) -- System Details -- Details: Minecraft Version: 1.6.4 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 207136384 bytes (197 MB) / 402653184 bytes (384 MB) up to 1073741824 bytes (1024 MB) JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used Suspicious classes: FML and Forge are installed IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP v8.11 FML v6.4.50.1,345 Minecraft Forge 9.11.1.1345 104 mods loaded, 104 mods active mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed FML{6.4.50.1,345} [Forge Mod Loader] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed Forge{9.11.1.1345} [Minecraft Forge] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed AppliedEnergistics-Core{rv14.finale3} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed CodeChickenCore{0.9.0.7} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed NotEnoughItems{1.6.1.8} [Not Enough Items] (notenoughitems 1.6.1.8.jar) Unloaded->Constructed OpenModsCore{0.4} [OpenModsCore] (minecraft.jar) Unloaded->Constructed PowerCrystalsCore{1.1.8} [PowerCrystals Core] (powercrystalscore-1.1.8-9.jar) Unloaded->Constructed TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed AppliedEnergistics{rv14.finale3} [Applied Energistics] (appeng-rv14-finale3-mc16x.jar) Unloaded->Constructed ArchimedesShipsMod{1.6.4 v1.4.5} [Archimedes' Ships] (Archimedes-Ships-Mod-1.6.4.zip) Unloaded->Constructed Autoutils{1.0.1} [Autoutils] (autoutils-1.6.4-1.0.1.jar) Unloaded->Constructed Backpack{1.28.37} [Backpack] (backpacks_mod_1.6.4.jar) Unloaded->Constructed BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed BiomesOPlenty{1.1.1} [Biomes O' Plenty] (BiomesOPlenty-universal-1.6.4-1.1.1.48.jar) Unloaded->Constructed bspkrsCore{v5.3(1.6.4)} [bspkrsCore] (bspkrscorev5.3.zip) Unloaded->Constructed BuildCraft|Core{4.2.2} [BuildCraft] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed BuildCraft|Builders{4.2.2} [BC Builders] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed BuildCraft|Energy{4.2.2} [BC Energy] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed BuildCraft|Factory{4.2.2} [BC Factory] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed BuildCraft|Transport{4.2.2} [BC Transport] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed BuildCraft|Silicon{4.2.2} [BC Silicon] (BUILDCRAFT-A-1.6.4-4.2.2.jar) Unloaded->Constructed Additional-Buildcraft-Objects{1.0.7.560} [Additional Buildcraft Objects] (buildcraft-Z-additional-buildcraft-objects-1.0.7.560.jar) Unloaded->Constructed CarpentersBlocks{2.0.8} [Carpenter's Blocks] (carpentersblocks v2.0.8 - MC 1.6+.zip) Unloaded->Constructed cfm{3.4} [§9MrCrayfish's Furniture Mod] (cfm-3.4-mc1.7.10.jar) Unloaded ChickenChunks{1.3.3.3} [ChickenChunks] (ChickenChunks 1.3.3.3.jar) Unloaded Chisel{1.4.11} [Chisel] (chisel-1.6.4-1.4.11.jar) Unloaded ComputerCraft{1.58} [ComputerCraft] (ComputerCraft1.58.zip) Unloaded CCTurtle{1.58} [ComputerCraft Turtles] (ComputerCraft1.58.zip) Unloaded DamageIndicatorsMod{2.9.2.3} [Damage Indicators] (damageindicatorsv2.9.2.3.zip) Unloaded EnderStorage{1.4.3.5} [EnderStorage] (EnderStorage 1.4.3.5.jar) Unloaded EE3{0.1} [Equivalent Exchange 3] (equivalentexchange3-1.6.4-0.1.140.jar) Unloaded LogisticsPipes|Main{0.7.4.dev.205} [Logistics Pipes] (logisticspipes-mc1.6.4-0.7.4.dev.205.jar) Unloaded Waila{1.5.2a} [Waila] (waila_1.5.2a.zip) Unloaded extracells{1.6.8f} [ExtraCells] (extracells-1.6.8f.jar) Unloaded Mystcraft{0.10.12.01} [Mystcraft] (mystcraft-uni-1.6.4-0.10.12.01.zip) Unloaded OpenMods{0.4} [OpenMods] (openmodslib-0.4b.jar) Unloaded UniversalElectricity{3.1.0} [Universal Electricity] (universal-electricity-3.1.0.66-core.jar) Unloaded ForgeMultipart{1.0.0.250} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.250.jar) Unloaded ProjRed|Core{4.3.7.32} [ProjectRed] (projectredbase-1.6.4-4.3.7.32.jar) Unloaded ProjRed|Transmission{4.3.7.32} [ProjectRed-Transmission] (projectredintegration-1.6.4-4.3.7.32.jar) Unloaded OpenPeripheralCore{0.3.3} [OpenPeripheralCore] (openperipheralcore-0.3.3.jar) Unloaded ExtraUtilities{1.0.1} [Extra Utilities] (extrautils-1.0.2.zip) Unloaded GalacticraftCore{2.0.12} [Galacticraft Core] (galacticraft-1.6.4-2.0.12.1026.jar) Unloaded GalacticraftMars{2.0.12} [Galacticraft Mars] (galacticraft-planets-1.6.4-2.0.12.1026.jar) Unloaded GregsLighting{1.9.1} [Greg's Lighting] (GregsLighting-1.9.1-mc1.6.4.jar) Unloaded Hats{2.1.6} [Hats] (ichuns-hats-mod-1.6.4.zip) Unloaded inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77.jar) Unloaded IronChest{5.4.1.697} [Iron Chest] (ironchest-universal-1.6.4-5.4.1.697.zip) Unloaded mca{3.6.0} [Minecraft Comes Alive] (MCA-3.6.0_MC-1.6.4.zip) Unloaded MFR Compat Forestry Trees{1.0} [MFR Compat Forestry Trees] (minefactoryreloaded-2.7.8-482.jar) Unloaded MFR Compat Extra Trees{1.0} [MFR Compat Extra Trees] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded{1.6.4R2.7.8} [MineFactory Reloaded] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatAppliedEnergistics{1.6.4R2.7.8} [MFR Compat: Applied Energistics] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatAtum{1.6.4R2.7.8} [MFR Compat: Atum] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatBackTools{1.6.4R2.7.8} [MFR Compat: BackTools] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatBuildCraft{1.6.4R2.7.8} [MFR Compat: BuildCraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatChococraft{1.6.4R2.7.8} [MFR Compat: Chococraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatExtraBiomes{1.6.4R2.7.8} [MFR Compat: ExtraBiomes] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatForestry{1.6.4R2.7.8} [MFR Compat: Forestry] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatForestryPre{1.6.4R2.7.8} [MFR Compat: Forestry (part 2)] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatForgeMicroblock{1.6.4R2.7.8} [MFR Compat: ForgeMicroblock] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatIC2{1.6.4R2.7.8} [MFR Compat: IC2] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatMystcraft{1.6.4R2.7.8} [MFR Compat: Mystcraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatPams{1.6.4R2.7.8} [MFR Compat: Pam's Mods] (minefactoryreloaded-2.7.8-482.jar) Unloaded ProjRed|Exploration{4.3.7.32} [ProjectRed-Exploration] (projectredworld-1.6.4-4.3.7.32.jar) Unloaded MineFactoryReloaded|CompatProjRed{1.6.4R2.7.8} [MFR Compat ProjectRed] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatRailcraft{1.6.4R2.7.8} [MFR Compat: Railcraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatRP2{1.6.4R2.7.8} [MFR Compat: RP2] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatSufficientBiomes{1.6.4R2.7.8} [MFR Compat: Sufficient Biomes] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatThaumcraft{1.6.4R2.7.8} [MFR Compat: Thaumcraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatThermalExpansion{1.6.4R2.7.8} [MFR Compat: Thermal Expansion] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatTwilightForest{1.6.4R2.7.8} [MFR Compat: TwilightForest] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatVanilla{1.6.4R2.7.8} [MFR Compat: Vanilla] (minefactoryreloaded-2.7.8-482.jar) Unloaded MineFactoryReloaded|CompatXyCraft{1.6.4R2.7.8} [MFR Compat: XyCraft] (minefactoryreloaded-2.7.8-482.jar) Unloaded numina{0.1.2-55} [Numina] (numina-1.6.2-0.1.2-55.jar) Unloaded powersuits{0.10.0-91} [MachineMuse's Modular Powersuits] (modularpowersuits-1.6.4-0.10.0-91.jar) Unloaded Morph{0.5.0} [Morph] (morphing_mod_1.6.4.zip) Unloaded NEIPlugins{1.1.0.6} [NEI Plugins] (neiplugins-1.1.0.6.jar) Unloaded NetherOres{1.6.2R2.2.2} [Nether Ores] (netherores-2.2.2-55.jar) Unloaded OCS{1.6.4.1} [OpenCCSensors] (OPENCCSENSORS-1.6.4.1B.jar) Unloaded OpenPeripheral{0.1.3} [OpenPeripheralAddons] (openperipheraladdons-0.1.3.jar) Unloaded powersuitaddons{@VERSION@} [Andrew's Modular Powersuits Addons] (powersuitaddons-1.6.4-884.jar) Unloaded bau5_ProjectBench{1.8.0} [Project Bench] (ProjectBench-1.6.2-v1.8.0.jar) Unloaded ProjRed|Transportation{4.3.7.32} [ProjectRed-Transportation] (projectredmechanical-BETA-1.6.4-4.3.7.32.jar) Unloaded TConstruct{1.5.13EX} [Tinkers' Construct] (TConstruct_mc1.6.4_EX.30.jar) Unloaded ProjRed|Compatibility{4.3.7.32} [ProjectRed-Compatibility] (projectredcompat-1.6.4-4.3.7.32.jar) Unloaded ProjRed|Integration{4.3.7.32} [ProjectRed-Integration] (projectredintegration-1.6.4-4.3.7.32.jar) Unloaded ProjRed|Illumination{4.3.7.32} [ProjectRed-Illumination] (projectredlighting-1.6.4-4.3.7.32.jar) Unloaded ProjRed|Expansion{4.3.7.32} [ProjectRed-Expansion] (projectredmechanical-BETA-1.6.4-4.3.7.32.jar) Unloaded QuantumCraft{1.1} [qCraft] (qcraft1.1.jar) Unloaded JAKJ_RedstoneInMotion{2.3.0.0} [Redstone In Motion] (redstoneinmotion_2.3.0.0_mc1.6.zip) Unloaded secretroomsmod{4.6.2} [The SecretRoomsMod] (SecretRoomsMod-universal-1.6.4-4.6.2.324.jar) Unloaded StevesCarts{2.0.0.b10} [Steve's Carts 2] (stevescarts2.0.0.b10.zip) Unloaded TreeCapitator{Forge 1.6.4.r09} [Treecapitator] (TREECAPITATOR.FORGE.1.6.4.R09.UNIVERSAL.zip) Unloaded Vending{1.1.1} [Vending] (vending-1.6.4-1.1.1.jar) Unloaded weaponmod{1.6.2 v1.13.5} [Balkon's WeaponMod] (WeaponMod.zip) Unloaded WR-CBE|Core{1.4.0.6} [WR-CBE Core] (WR-CBE 1.4.0.6.jar) Unloaded WR-CBE|Addons{1.4.0.6} [WR-CBE Addons] (WR-CBE 1.4.0.6.jar) Unloaded WR-CBE|Logic{1.4.0.6} [WR-CBE Logic] (WR-CBE 1.4.0.6.jar) Unloaded mod_ZanMinimap{Not available} [mod_ZanMinimap] (Zans-Minimap-Mod-Forge-1.6.4.zip) Unloaded McMultipart{1.0.0.250} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.250.jar) Unloaded ForgeMicroblock{1.0.0.250} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.250.jar) Unloaded Launched Version: 1.6.4-Forge9.11.1.1345 LWJGL: 2.9.0 OpenGL: Intel(R) HD Graphics GL version 4.3.0 - Build 20.19.15.4549, Intel Is Modded: Definitely; Client brand changed to 'fml,forge' Type: Client (map_client.txt) Resource Pack: Default Current Language: English (US) Profiler Position: N/A (disabled) Vec3 Pool Size: ~~ERROR~~ NullPointerException: null Please and thank you for helping me.