Error when loading up minecraft 1.15.2 with forge

[GotGnome]

I posted this hours ago with no response so I am going to try again

Heres the error. 

The game crashed whilst initializing game

Error: java.lang.NoClassDefFoundError:

net/minecraft/client/renderer/IImageBuffer

 

---- Minecraft Crash Report ----
// Don't be sad, have a hug! ❤️

Time: 5/12/20 4:28 PM
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/IImageBuffer
    at net.minecraft.client.resources.SkinManager.<init>(SkinManager.java) ~[?:?] {re:classloading,xf:fml:customskinloader:SkinManagerTransformer}
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:399) [?:?] {re:classloading,pl:accesstransformer:B,xf:fml:customskinloader:MinecraftTransformer,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(SourceFile:166) [?:?] {re:classloading}
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) [forge-1.15.2-31.1.79.jar:31.1] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$476/389519344.call(Unknown Source) [forge-1.15.2-31.1.79.jar:31.1] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.1.0.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.1.0.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.1.0.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.1.0.jar:?] {re:classloading}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.1.0.jar:?] {re:classloading}
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.IImageBuffer
    at java.lang.ClassLoader.findClass(ClassLoader.java:530) ~[?:1.8.0_51] {}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_51] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:101) ~[modlauncher-5.1.0.jar:?] {re:classloading}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51] {}
    ... 14 more

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

-- Head --
Thread: Render thread
Stacktrace:
    at net.minecraft.client.resources.SkinManager.<init>(SkinManager.java)
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:399)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.main.Main.main(SourceFile:166)
    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.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56)
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$476/389519344.call(Unknown Source)
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    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: 703180048 bytes (670 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
    CPUs: 6
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    ModLauncher: 5.1.0+69+master.79f13f7
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services: 
        /eventbus-2.2.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.2-31.1.79.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.2-31.1.79.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.2-31.1.79.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.15.2-31.1.79.jar runtimedistcleaner PLUGINSERVICE 
        /preview_OptiFine_1.15.2_HD_U_G1_pre16.jar OptiFine TRANSFORMATIONSERVICE 
        /forge-1.15.2-31.1.79.jar fml TRANSFORMATIONSERVICE 
        /MixinBootstrap-1.0.3.jar mixinbootstrap TRANSFORMATIONSERVICE 
        /OptiForge-MC1.15.2-0.1.17.jar optiforge TRANSFORMATIONSERVICE 
        /MixinBootstrap-1.0.3.jar mixin PLUGINSERVICE 
        /MixinBootstrap-1.0.3.jar mixinbootstrap PLUGINSERVICE 
    FML: 31.1
    Forge: net.minecraftforge:31.1.79
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.15.2-31.1.79-client.jar Minecraft {[email protected] COMMON_SETUP}
        Lucky-Block-Mod-1.15.2.jar Lucky Block {[email protected] COMMON_SETUP}
        CyclopsCore-1.15.2-1.6.2.jar Cyclops Core {[email protected] COMMON_SETUP}
        pandoras_creatures-1.15.2-1.0.0.jar Pandoras Creatures {[email protected] COMMON_SETUP}
        Mob-Heads-Mod-1.15.2 .jar Mob Heads {[email protected] COMMON_SETUP}
        Greater-Eye-of-Ender-Mod-1.15.2.jar GreaterEye {[email protected] COMMON_SETUP}
        morevanillalib-1.15.2-1.2.2.jar MoreVanillaLib {[email protected] COMMON_SETUP}
        Crafting-Station-Mod-1.15.2.jar Crafting Station {[email protected] COMMON_SETUP}
        Advanced-Skin-Customization-Mod-1.15.2.jar Advanced Skin Customization {[email protected] COMMON_SETUP}
        vanillaexcavators-1.15.2-2.1.jar Vanilla Excavators {[email protected] COMMON_SETUP}
        CustomSkinLoader_Forge-14.11.jar CustomSkinLoader {[email protected] COMMON_SETUP}
        morevanillatools-1.15.2-2.1.jar MoreVanillaTools {[email protected] COMMON_SETUP}
        jei-1.15.2-6.0.0.4.jar Just Enough Items {[email protected] COMMON_SETUP}
        OptiForge-MC1.15.2-0.1.17.jar OptiForge {[email protected] COMMON_SETUP}
        EverlastingAbilities-1.15.2-1.6.1.jar EverlastingAbilities {[email protected] COMMON_SETUP}
        DoggyTalents-1.15.2-1.15.2.3.jar Doggy Talents {[email protected] COMMON_SETUP}
        goblintraders-1.2.0-mc1.15.2.jar Goblin Traders {[email protected] COMMON_SETUP}
        Craftable+Saddles+[1.15.2]-1.3.jar Craftable Saddles {[email protected] COMMON_SETUP}
        Xaeros-Minimap-Mod-1.15.2.jar Xaero's Minimap {[email protected] COMMON_SETUP}
        Just-Another-Rotten-Flesh-to-Leather-Mod-1.15.2.jar JRFTL {[email protected] COMMON_SETUP}
        good-nights-sleep-1.15.2-1.0.2.jar Good Night's Sleep {[email protected] COMMON_SETUP}
        backpacked-1.4.1-mc1.15.2.jar Backpacked {[email protected] COMMON_SETUP}
        vanillahammers-1.15.2-2.1.jar Vanilla Hammers {[email protected] COMMON_SETUP}
        lostcities-1.15-3.0.0-alpha.jar LostCities {[email protected] COMMON_SETUP}
        OfflineSkins-1.15.2-v1.jar OfflineSkins {[email protected] COMMON_SETUP}
        Nomadic-Tents-Mod-1.15.2.jar Nomadic Tents {[email protected] COMMON_SETUP}
        improvedwolves-1.1.1-mc1.15.2.jar Improved Wolves {[email protected] COMMON_SETUP}
        guncus-1.15.2-1.1.jar Gun Customization {[email protected] COMMON_SETUP}
        Unforgiving-Void-Mod-1.15.2.jar Unforgiving Void {[email protected] COMMON_SETUP}
        morevanillaarmor-1.15.2-1.2.jar MoreVanillaArmor {[email protected] COMMON_SETUP}
        MrCrayfishs-Furniture-Mod-1.15.2.jar MrCrayfish's Furniture Mod {[email protected] COMMON_SETUP}
        Macaws-Doors-Mod-1.15.2.jar Macaw's Doors {[email protected] COMMON_SETUP}
        mahoutsukai-1.15.2-v1.17.2.jar Mahou Tsukai {[email protected] COMMON_SETUP}
        venture-1.0.0-mc1.15.2.jar Venture {[email protected] COMMON_SETUP}
        Voyage-Mod-1.15.2.jar Voyage {[email protected] COMMON_SETUP}
        Stronghold-Compass-Mod-1.15.2.jar Ender Compass {[email protected] COMMON_SETUP}
        forge-1.15.2-31.1.79-universal.jar Forge {[email protected] COMMON_SETUP}
        More-Dogs-Mod-1.15.2.jar More Dog Breeds {[email protected] COMMON_SETUP}
        Pretty-Pipes-Mod-1.15.2.jar Pretty Pipes {[email protected] COMMON_SETUP}
        Ender-Mail-Mod-1.15.2.jar Ender Mail {[email protected] COMMON_SETUP}
        corpse-1.15.2-1.0.0.jar Corpse {[email protected] COMMON_SETUP}
    Launched Version: 1.15.2-forge-31.1.79
    Backend library: LWJGL version 3.2.2 build 10
    Backend API: GeForce GTX 1080/PCIe/SSE2 GL version 4.6.0 NVIDIA 445.87, NVIDIA Corporation
    GL Caps: Using framebuffer using OpenGL 3.0
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    CPU: 6x Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
    OptiFine Version: OptiFine_1.15.2_HD_U_G1_pre16
    OptiFine Build: 20200506-004910
    Render Distance Chunks: 16
    Mipmaps: 4
    Anisotropic Filtering: 1
    Antialiasing: 0
    Multitexture: false
    Shaders: Sildurs Vibrant Shaders v1.27 High.zip
    OpenGlVersion: 4.6.0 NVIDIA 445.87
    OpenGlRenderer: GeForce GTX 1080/PCIe/SSE2
    OpenGlVendor: NVIDIA Corporation
    CpuCount: 6

 

If anyone knows a fix it would be much appreciated I really don't want to loose my modded survival world.

[squidlex]

25 minutes ago, GotGnome said:

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/IImageBuffer
    at net.minecraft.client.resources.SkinManager

Removing custom skin manager should (hopefully) fix it, I'd try this first. The mod is trying to access a class that does not exist in your minecraft directory. If nothing happens, uninstall OfflineSkins too, although I can't see how that is effecting it in your crashlog.

 

If that doesn't work, or even if it does, try updating and reinstalling Forge.

Edited May 12, 2020 by squidlex

[GotGnome]

Thank you to Squidlex this worked