First of: Hello. A fresh one* arrived 
*to the Ic2 forums, that is.
I have an issue with either Forestry or IC2, logs are ... misleading.
So without further indue, here goes the spoiler:
The Almighty Minecraft Error Report:
Mods loaded: 13
ModLoader 1.1
mod_ModLoaderMp 1.0.0
mod_BuildCraftCore 3.1.2
mod_BuildCraftBuilders 3.1.2
mod_BuildCraftEnergy 3.1.2
mod_BuildCraftFactory 3.1.2
mod_BuildCraftTransport 3.1.2
mod_BuildCraftSilicon 3.1.2
mod_zAdditionalPipes Rev34.0
mod_BuildCraftZFP (Forestry Package)
mod_Forestry 1.3.0.0
mod_IC2 v1.62
mod_LogisticsPipes 0.1.7 (built with Minecraft 1.1.0, Buildcraft 3.1.2, Forge 1.3.1)
Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem.
If you wish to report this, please copy this entire text and email it to support@mojang.com.
Please include a description of what you did when the error occured.
--- BEGIN ERROR REPORT 3d9b2907 --------
Generated 23.01.12 14:03
Minecraft: Minecraft 1.1
OS: Windows 7 (x86) version 6.1
Java: 1.7.0_04-ea, Oracle Corporation
VM: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
LWJGL: 2.4.2
OpenGL: GeForce 6800 LE/PCI/SSE2/3DNOW! version 2.1.2, NVIDIA Corporation
java.lang.NoSuchFieldError: nameReference
at ic2.common.IC2Crops.registerCrops(IC2Crops.java:37)
at mod_IC2.initialize(mod_IC2.java:586)
at ic2.platform.Ic2.load(Ic2.java:65)
at ModLoader.init(ModLoader.java:824)
at ModLoader.AddAllRenderers(ModLoader.java:189)
at afq.<init>(afq.java:80)
at afq.<clinit>(afq.java:9)
at net.minecraft.client.Minecraft.a(SourceFile:265)
at net.minecraft.client.Minecraft.run(SourceFile:648)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 5b3c0caf ----------
The Modloader:
sty 23, 2012 2:03:09 PM ModLoader init
FINE: ModLoader 1.1 Initializing...
sty 23, 2012 2:03:09 PM ModLoader readFromClassPath
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\bin\minecraft.jar
sty 23, 2012 2:03:09 PM ModLoader readFromClassPath
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_ModLoaderMp 1.0.0" from mod_ModLoaderMp.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-A-core-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftCore 3.1.2" from mod_BuildCraftCore.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-B-builders-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftBuilders 3.1.2" from mod_BuildCraftBuilders.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-B-energy-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftEnergy 3.1.2" from mod_BuildCraftEnergy.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-B-factory-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftFactory 3.1.2" from mod_BuildCraftFactory.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-B-transport-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftTransport 3.1.2" from mod_BuildCraftTransport.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-C-silicon-3.1.2.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftSilicon 3.1.2" from mod_BuildCraftSilicon.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\buildcraft-client-DA-additionalpipes-34.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_zAdditionalPipes Rev34.0" from mod_zAdditionalPipes.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\forestry-client-A-1.3.0.jar
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_BuildCraftZFP (Forestry Package)" from mod_BuildCraftZFP.class
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_Forestry 1.3.0.0" from mod_Forestry.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\industrialcraft-2-client_1.62.jar
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_IC2 v1.62" from mod_IC2.class
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Users\Mateusz\AppData\Roaming\.minecraft\mods\LogisticsPipes-BC3-0.1.7.zip
sty 23, 2012 2:03:10 PM ModLoader readFromModFolder
FINER: Zip found.
sty 23, 2012 2:03:10 PM ModLoader addMod
FINE: Mod Initialized: "mod_LogisticsPipes 0.1.7 (built with Minecraft 1.1.0, Buildcraft 3.1.2, Forge 1.3.1)" from mod_LogisticsPipes.class
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_ModLoaderMp 1.0.0"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftCore 3.1.2"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftBuilders 3.1.2"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftEnergy 3.1.2"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftFactory 3.1.2"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftTransport 3.1.2"
sty 23, 2012 2:03:10 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftSilicon 3.1.2"
sty 23, 2012 2:03:11 PM ModLoader init
FINE: Mod Loaded: "mod_zAdditionalPipes Rev34.0"
sty 23, 2012 2:03:11 PM ModLoader init
FINE: Mod Loaded: "mod_BuildCraftZFP (Forestry Package)"
sty 23, 2012 2:03:11 PM forge.ForgeHooks <clinit>
INFO: MinecraftForge V1.3.1 Initialized
sty 23, 2012 2:03:11 PM ModLoaderMp Log
FINE: ModLoaderMP 1.0.0 Initialized
sty 23, 2012 2:03:11 PM ModLoader init
FINE: Mod Loaded: "mod_Forestry 1.3.0.0"
sty 23, 2012 2:03:11 PM ModLoader init
FINER: THROW
java.lang.NoSuchFieldError: nameReference
at ic2.common.IC2Crops.registerCrops(IC2Crops.java:37)
at mod_IC2.initialize(mod_IC2.java:586)
at ic2.platform.Ic2.load(Ic2.java:65)
at ModLoader.init(ModLoader.java:824)
at ModLoader.AddAllRenderers(ModLoader.java:189)
at afq.<init>(afq.java:80)
at afq.<clinit>(afq.java:9)
at net.minecraft.client.Minecraft.a(SourceFile:265)
at net.minecraft.client.Minecraft.run(SourceFile:648)
at java.lang.Thread.run(Unknown Source)
Externals used:
- ModLoader for 1.1
- ModLoaderMP v2 for 1.1 (it registers as 1.0.0, propably a bug)
- MCForge 1.3.2 for 1.1
- Buildcraft 3.1.2 for 1.1
- Zeldo's Additional Pipes v34 for 1.1 /BC 3.1.2
- Kraft's Logistic Pipes 0.17A for 1.1 /BC 3.1.2
- Ic2 1.62 for 1.1
- Forestry 1.3.0 for 1.1
- IDResolver v1 for 1.1
- CARuins 2.30 for 1.1
I've succesfuly updated TechnicPack to the latest versions *of the mods included* of MC 1.0 (even with maitaining the IDs!), so i think i've done everything correctly to do the same but up to MC 1.1
But you never know, right? If you see anything fishy at the logs please advise.