i got the following crash log:
2013-12-29 12:07:19 [FINEST] [IC2] Sending event FMLConstructionEvent to mod IC2
2013-12-29 12:07:19 [INFO] [STDOUT] ---- Minecraft Crash Report ----
2013-12-29 12:07:19 [INFO] [STDOUT] // Quite honestly, I wouldn't worry myself about that.
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT] Time: 29.12.13 12:07
2013-12-29 12:07:19 [INFO] [STDOUT] Description: Initializing game
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT] java.lang.VerifyError: (class: ic2/core/IC2, method: playerLoggedIn signature: (Lcpw/mods/fml/common/network/Player;Lnet/minecraft/network/packet/Packet254ServerPing;Lnet/minecraft/nbt/NBTTagIntArray;)V) Incompatible argument to function
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.Class.forName0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.Class.forName(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.main.Main.main(SourceFile:101)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT] A detailed walkthrough of the error, its code path and all known details is as follows:
2013-12-29 12:07:19 [INFO] [STDOUT] ---------------------------------------------------------------------------------------
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT] -- Head --
2013-12-29 12:07:19 [INFO] [STDOUT] Stacktrace:
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.Class.forName0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.Class.forName(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:462)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-12-29 12:07:19 [INFO] [STDOUT] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
2013-12-29 12:07:19 [INFO] [STDOUT] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)
2013-12-29 12:07:19 [INFO] [STDOUT]
2013-12-29 12:07:19 [INFO] [STDOUT] -- Initialization --
2013-12-29 12:07:19 [INFO] [STDOUT] Details:
2013-12-29 12:07:19 [INFO] [STDOUT] Stacktrace:
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.client.main.Main.main(SourceFile:101)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at java.lang.reflect.Method.invoke(Unknown Source)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
2013-12-29 12:07:19 [INFO] [STDOUT] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
i only installed forge and IC2, and i have bought minecraft and logged in correctly (just in case someone asks)
pls tell me what ive done wrong
EDIT:
just realized that this is an old version, the new experimental is working 