spiderwalker

For some weird reason whenever i restart my Tekkit Classic all of my achievements reset and it's very annoying. When I only complete vanilla achievements this doesn't happen,it's only when i complete IC2(IndustrialCraft2) achievements.

Launcher Version: 1.2.5 Operating System: windows 7 Java Version: 7 update 7 Antivirus Program: avast Description of Problem: was working fine and then suddenly not without any changes to system. Launcher will show logging in, downloading terrain and then just go to a white screen Error Messages: 2013-09-01 11:05:56 [sEVERE] A critical error has occurred. java.lang.IndexOutOfBoundsException at eloraam.core.ItemParts.b(ItemParts.java:32) at yr.g(Item.java:244) at aan.b(SourceFile:84) at tw.a(RenderItem.java:278) at aiy.a(GuiIngame.java:756) at aiy.a(GuiIngame.java:333) at lr.b(EntityRenderer.java:1087) at net.minecraft.client.Minecraft.x(Minecraft.java:876) at net.minecraft.client.Minecraft.run(Minecraft.java:753) at java.lang.Thread.run(Unknown Source) 2013-09-01 11:05:56 [sEVERE] 41 mods loaded Optifine OptiFine_1.2.5_HD_S_C6 Minecraft Forge 3.3.8.164 FML v2.2.106.176 Error Log: