same thing as him, this is my error log, i think this may be the same thing happening again. i could compleatly re-install minecraft, not jsut the bin. but i'm on bad internet connection.
error log
Nov 6, 2011 4:38:01 PM ModLoader init
FINE: ModLoader Beta 1.8.1 Initializing...
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\mods\gui
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Directory found.
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\mods\minecolony
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Directory found.
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\mods\MineColony 0.7rc13.zip
Nov 6, 2011 4:38:01 PM ModLoader readFromModFolder
FINER: Zip found.
Nov 6, 2011 4:38:01 PM ModLoader addMod
FINE: Failed to load mod from "mod_MineColony.class"
Nov 6, 2011 4:38:01 PM ModLoader addMod
FINER: THROW
java.lang.VerifyError: (class: mod_MineColony, method: OpenModGUI signature: (Lgs;Ljava/lang/Object;)Lid;) Incompatible argument to function
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.privateGetPublicFields(Unknown Source)
at java.lang.Class.getFields(Unknown Source)
at ModLoader.setupProperties(ModLoader.java:1583)
at ModLoader.addMod(ModLoader.java:274)
at ModLoader.readFromModFolder(ModLoader.java:1179)
at ModLoader.init(ModLoader.java:824)
at ModLoader.AddAllRenderers(ModLoader.java:186)
at aam.<init>(aam.java:61)
at aam.<clinit>(aam.java:10)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at net.minecraft.client.Minecraft.run(SourceFile:629)
at java.lang.Thread.run(Unknown Source)
Nov 6, 2011 4:38:11 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\mods\mob
Nov 6, 2011 4:38:11 PM ModLoader readFromModFolder
FINER: Directory found.
Nov 6, 2011 4:38:11 PM ModLoader readFromModFolder
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\mods\rei_minimap
Nov 6, 2011 4:38:11 PM ModLoader readFromModFolder
FINER: Directory found.
Nov 6, 2011 4:38:11 PM ModLoader readFromClassPath
FINER: Adding mods from C:\Documents and Settings\Ethan\Application Data\.minecraft\bin\minecraft.jar
Nov 6, 2011 4:38:11 PM ModLoader readFromClassPath
FINER: Zip found.
Nov 6, 2011 4:38:11 PM ModLoader addMod
FINE: Mod Loaded: "mod_EllianDetector 1.20 - v1.0" from mod_EllianDetector.class
Nov 6, 2011 4:38:11 PM ModLoader addMod
FINE: Mod Loaded: "mod_ReiMinimap v1.9 [Beta 1.8]" from mod_ReiMinimap.class
Nov 6, 2011 4:38:11 PM ModLoader addMod
FINE: Mod Loaded: "mod_TooManyItems 1.8 2011-09-14a" from mod_TooManyItems.class
Nov 6, 2011 4:38:11 PM ModLoader AddAllRenderers
FINE: Initialized