primalcraft

I deleted my launcher folder and re-ran it. Seems to have worked but what the heck happend?!

I knew that updating probably wasnt a good idea because something like this might happen. soooo I updated my launcher and now when it starts minecraft it crashes and gives me this message. --- BEGIN ERROR REPORT 476157c3 -------- Generated 2/16/12 9:07 PM Minecraft: Minecraft 1.1 OS: Mac OS X (i386) version 10.6.8 Java: 1.6.0_29, Apple Inc. VM: Java HotSpot Client VM (mixed mode), Apple Inc. LWJGL: 2.4.2 OpenGL: ATI Radeon X1600 OpenGL Engine version 2.0 ATI-1.6.36, ATI Technologies Inc. java.lang.IllegalArgumentException: Slot 249 is already occupied by ic2.common.BlockTex@da21bf when adding ic2.common.BlockTex@dd8b3d at oe.<init>(Block.java:176) at oe.<init>(Block.java:204) at ic2.platform.BlockCommon.<init>(BlockCommon.java:12) at ic2.common.BlockTex.<init>(BlockTex.java:30) at mod_IC2.initialize(mod_IC2.java:238) 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(Minecraft.java:316) at net.minecraft.client.Minecraft.run(Minecraft.java:624) at java.lang.Thread.run(Thread.java:680) --- END ERROR REPORT 5bf32002 ---------- I get that it has something to do with block ID's but i have no idea how to fix it.