Having a bit of an issue, it appears to be a blockid issue, but I have double and tripple checked the config files for both mods (PowerCraft and IC2) and there does not seem to be any conflict. I am using ID's 140-170 for IC2 and ID's 206-228 for Powercraft.
This is the error report it keeps generating.
Code
--- BEGIN ERROR REPORT 63fa4d98 --------
Generated 1/23/12 11:04 PM
Minecraft: Minecraft 1.1
OS: Windows 7 (amd64) version 6.1
Java: 1.6.0_29, Sun Microsystems Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5700 Series version 4.2.11318 Compatibility Profile Context, ATI Technologies Inc.
java.lang.IllegalArgumentException: Slot 218 is already occupied by PCtr_BlockConveyor@15e7d12b when adding ic2.common.BlockCrop@26556949
at oe.<init>(Block.java:176)
at aew.<init>(BlockContainer.java:7)
at ic2.platform.BlockContainerCommon.<init>(BlockContainerCommon.java:8)
at ic2.common.BlockCrop.<init>(BlockCrop.java:32)
at mod_IC2.initialize(mod_IC2.java:301)
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 3b29d125 ----------Any help with this would be great, and I apologize in advance if this has been addressed recently.
Edit: I figured it out, seems in my rush to update I forgot to allow a new config file to generate for IC2, and since crops did not exist prior to this release, the older config file was missing it. Sorry for the waste of time, hopefully this helps someone =/