When I downloaded forge installed it and ran minecraft on it crashed many times. It said :

The game crashed whilst initializing game
The game crashed whilst initializing game
Error: java.lang.NoClassDefFoundError: cvm

 

do you guys know what it means?

 

 

 

this is the forge I'm using

 

 

I got the forge in

 

http://files.minecraftforge.net/

 

Post the FML log (logs/fml-client-latest.log inside your game directory).

my crash report was

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Shall we play a game?

Time: 6/26/17 9:19 AM
Description: Initializing game

java.lang.NoClassDefFoundError: cvm
 at java.lang.Class.getDeclaredFields0(Native Method)
 at java.lang.Class.privateGetDeclaredFields(Class.java:2575)
 at java.lang.Class.getField0(Class.java:2967)
 at java.lang.Class.getField(Class.java:1693)
 at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:274)
 at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:190)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:417)
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
 at net.minecraft.client.main.Main.main(SourceFile:124)
 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.ClassNotFoundException: cvm
 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 ... 15 more
Caused by: java.lang.NullPointerException
 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
 ... 17 more

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

-- Head --
Stacktrace:
 at java.lang.Class.getDeclaredFields0(Native Method)
 at java.lang.Class.privateGetDeclaredFields(Class.java:2575)
 at java.lang.Class.getField0(Class.java:2967)
 at java.lang.Class.getField(Class.java:1693)
 at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:274)
 at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:190)
 at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:417)

-- Initialization --
Details:
Stacktrace:
 at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
 at net.minecraft.client.main.Main.main(SourceFile:124)
 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)

-- System Details --
Details:
 Minecraft Version: 1.8.8
 Operating System: Windows 10 (amd64) version 10.0
 Java Version: 1.8.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 71701408 bytes (68 MB) / 238100480 bytes (227 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
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML:
 Loaded coremods (and transformers):
 Launched Version: 1.8.8-forge1.8.8-11.15.0.1654-1.8.8
 LWJGL: 2.9.4
 OpenGL: Intel(R) HD Graphics 4600 GL version 4.3.0 - Build 20.19.15.4531, Intel
 GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

 Using VBOs: No
 Is Modded: Definitely; Client brand changed to 'fml,forge'
 Type: Client (map_client.txt)
 Resource Packs: §6Smooth Overlay.zip, !              §cDragonfruit §532x.zip
 Current Language: ~~ERROR~~ NullPointerException: null
 Profiler Position: N/A (disabled)
 CPU: 4x Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz

 

Edited June 26, 20178 yr by dennis

Why 1.8.8 out of all the 1.8 versions? You should really update to 1.11.2, or soon to 1.12. If you must use 1.8, use 1.8.9.

 

Do you have Optifine installed? If so, remove it. If the crashing stops, it's an issue with Optifine and you should report it to the author. If it doesn't, post the new FML log without any mods.