Noclassdeffounderror: Net/minecraft/src/modloader

When I start up Minecraft with the Forge profile created by the Windows installer, the game crashes before even being able to start up.

Minecraft version: 1.6.4
Forge version: 1.6.4-9.11.1.964
ComputerCraft version: 1.57
Java version: JDK 1.7.0_45

Bug report:

---- Minecraft Crash Report ----
// I feel sad now :(/>/>

Time: 23-11-13 16:54
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/src/ModLoader
at cpw.mods.fml.common.LoadController.transition(LoadController.java:152)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:671)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:241)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:509)
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(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:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/src/ModLoader
at dan200.turtle.client.TileEntityTurtleRenderer.<init>(TileEntityTurtleRenderer.java:49)
at dan200.turtle.client.CCTurtleProxyClient.load(CCTurtleProxyClient.java:64)
at dan200.CCTurtle.init(CCTurtle.java:127)
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:523)
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.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:197)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:177)
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.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:108)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:670)
... 10 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.src.ModLoader
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
... 42 more


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 277266192 bytes (264 MB) / 464519168 bytes (443 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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 v6.99.19.964 Minecraft Forge 9.11.1.964 5 mods loaded, 5 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{6.99.19.964} [Forge Mod Loader] (forge-1.6.4-9.11.1.964.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forge{9.11.1.964} [Minecraft Forge] (forge-1.6.4-9.11.1.964.jar) Unloaded->Constructed->Pre-initialized->Initialized
ComputerCraft{1.57} [ComputerCraft] (ComputerCraft1.57.zip) Unloaded->Constructed->Pre-initialized->Initialized
CCTurtle{1.57} [ComputerCraft Turtles] (ComputerCraft1.57.zip) Unloaded->Constructed->Pre-initialized->Errored

You might try an earlier version of forge. I've got 1.57 working on forge 949 right now, iirc.

Eh definitely a change in forge. I had a setup with x.935 that worked well but going to x.964 broke it. Roll back to a slightly older version of forge and should work for you again.

Any version past .953 seems to break most mods right now, after .953 they started to add in Forge Gradle and this broke many things.

Then I'll try downgrading to 1.952 and hope that will solve my problem.