This bug was also mentioned on the previous page by shadoskill, but no-one addressed it. I'm also having it. No ID troubles, just "Wrong return type in function".
Complete error log below.CodeDisplay MoreMods loaded: 14ModLoader 1.1mod_ModLoaderMp 1.0.0mod_BCIC2Crossover IBv0.05 for MC 1.1, BC 3.1.2, IC2 1.62mod_BuildCraftCore 3.1.3mod_BuildCraftBuilders 3.1.3mod_BuildCraftEnergy 3.1.3mod_BuildCraftFactory 3.1.3mod_BuildCraftTransport 3.1.3mod_BuildCraftSilicon 3.1.3mod_zAdditionalPipes Rev34.0mod_EnderChest 1.0.1mod_Forestry 1.2.6.4mod_IC2 v1.64mod_LogisticsPipes 0.1.8 (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 e38e5625 --------Generated 08/02/12 21:14 Minecraft: Minecraft 1.1OS: Windows 7 (amd64) version 6.1Java: 1.7.0_02, Oracle CorporationVM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle CorporationLWJGL: 2.4.2OpenGL: AMD Radeon HD 6800 Series version 4.2.11318 Compatibility Profile Context, ATI Technologies Inc. java.lang.VerifyError: (class: mod_IC2AdvancedMachines, method: getGuiFor signature: (Lvi;ILbq;)Lxe;) Wrong return type in function at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields(Unknown Source) at java.lang.Class.getDeclaredFields(Unknown Source) at ModLoader.setupProperties(ModLoader.java:1728) at ModLoader.addMod(ModLoader.java:268) at ModLoader.readFromModFolder(ModLoader.java:1305) at ModLoader.init(ModLoader.java:820) at ModLoader.AddAllRenderers(ModLoader.java:189) at afq.(afq.java:80) at afq.(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 2c52e05d ----------
Somewhere in that file it states ModLoaderMP 1.0.0. You need ModLoaderMP 1.1.X for it to work