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All I did was install Modloader (I'm on a Mac, and I followed the installation instructions) and MineCraft crashed. Here's my error log:

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception occured in ModLoader
This error has been saved to /Users/loganbartholomew/Library/Application Support/minecraft/crash-reports/crash-2012-08-04_19.57.26-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT c158e017 --------
Generated 8/4/12 7:57 PM

- Minecraft Version: 1.3.1
- Operating System: Mac OS X (i386) version 10.6.8
- Java Version: 1.6.0_33, Apple Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Apple Inc.
- Memory: 499868736 bytes (476 MB) / 535232512 bytes (510 MB) up to 1070399488 bytes (1020 MB)
- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
- ModLoader: Mods loaded: 1
ModLoader 1.3.1


java.lang.NoClassDefFoundError: BaseModMp
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at ModLoader.addMod(ModLoader.java:319)
at ModLoader.readFromModFolder(ModLoader.java:1413)
at ModLoader.init(ModLoader.java:916)
at ModLoader.addAllRenderers(ModLoader.java:169)
at avx.<init>(RenderManager.java:86)
at avx.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: BaseModMp
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 31 more
--- END ERROR REPORT 80fc8e24 ----------

Quote from Macro/Keybind mod page: "The current 'preliminary release' of modloader has a bug which causes it to crash with any mod requiring onTickInGame callbacks." When will this be fixed?

It seems that the new Optifine is not compatible with Rei's Modloader yet
http://imgur.com/5rijs

hi mods you can compile your java 5 as those of the minecraft 1.2.5 these if they worked in java 5 greetings

There is a Dropbox 404 Error for the Block Distortion Mod. Otherwise, these mods(at least the ones i tried) are awesome.

The link for the block distortion mod 404'd.

Problem, when I installed Modloader 1.3.1, my character skin changed. It now looks like a fully black person with one or two markings on the 'head'.

Modloader doesn't seem to work for me because I always get a black screen

Quote from 0_DarkBoy_059

I'm having an issue. >:l
I do exactly as the instructions say on the post and run Minecraft as usual, deleting the META-INF and all that.
When I run Minecraft mod loader isn't there at all. o_O What am I doing wrong?
I use a shortcut to go to my .minecraft folder and have no other mods in place.

1. Did you expand and drag ALL ModLoader.zip contents to the MC.jar?
2. ModLoader performs in the background. It allows other Mods to function. There is no indication when properly installed and no other Mods active,
3. If updating a previous please REMEMBER to remove all the old version mods from the mods folder.

Sigh another issue...

It seems that Armor Stand causes a MASSIVE drop in FPS for me. More than likely it's my crappy specs, but it seems to only be affected by the Armor Stand entity block (when I place one stand, my FPS drops at least by a quarter). This proves terrible when I have five stands at once, one for each armor type.

A minor issue with the same mod is that the buttons (skins, follow) don't seem to respond. I can't click on them or choose them or anything. I tried to see if it was the Texture Pack that conflicted, but it simply doesn't work.

Hopefully Risu will see this...

The new version of mod-loader is crashing my game. Any suggestions?

Welp, seems like a lot of people are getting the same issue, so I'm going to post my crash error text, if it's useful in any way...
---- Minecraft Crash Report ----
// Shall we play a game?

Time: 04/08/12 16:39
Description: ModLoader has failed to initialize.

java.lang.NoSuchFieldError: m
at mod_Timber.load(mod_Timber.java:19)
at ModLoader.init(ModLoader.java:922)
at ModLoader.addAllRenderers(ModLoader.java:169)
at avx.<init>(RenderManager.java:86)
at avx.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.3.1
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_32, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 450620520 bytes (429 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- ModLoader: Mods loaded: 4
ModLoader 1.3.1
mod_Shelf 1.3.1
mod_RecipeBook 1.3.1
mod_Timber 1.2.4

Quote from Tomg97

Welp, seems like a lot of people are getting the same issue, so I'm going to post my crash error text, if it's useful in any way...

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 04/08/12 16:39
Description: ModLoader has failed to initialize.

java.lang.NoSuchFieldError: m
at mod_Timber.load(mod_Timber.java:19)
at ModLoader.init(ModLoader.java:922)
at ModLoader.addAllRenderers(ModLoader.java:169)
at avx.<init>(RenderManager.java:86)
at avx.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.3.1
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_32, Sun Microsystems Inc.
- Java VM Version: Java HotSpot™ Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 450620520 bytes (429 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- ModLoader: Mods loaded: 4
ModLoader 1.3.1
mod_Shelf 1.3.1
mod_RecipeBook 1.3.1
mod_Timber 1.2.4

I wonder if mod_Timber 1.2.4 might be a problem?

[spoiler]Crash Report[/spoiler]

Yay updated to 1.3

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception occured in ModLoader
This error has been saved to C:\Users\Linda\AppData\Roaming\.minecraft\crash-reports\crash-2012-08-04_20.24.30-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 95331593 --------
Generated 8/4/12 8:24 PM

- Minecraft Version: 1.3.1
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_05, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 465396840 bytes (443 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- ModLoader: Mods loaded: 1
ModLoader 1.3.1


java.lang.VerifyError: (class: mod_MineColony, method: testBuilderInventory signature: ()V) Incompatible argument to 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:2048)
at ModLoader.addMod(ModLoader.java:326)
at ModLoader.readFromModFolder(ModLoader.java:1413)
at ModLoader.init(ModLoader.java:916)
at ModLoader.addAllRenderers(ModLoader.java:169)
at avx.<init>(RenderManager.java:86)
at avx.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 9398c511 ----------

Quote from Mr.OMG

yes it does

No I believe it does NOT, not at all atleast for me no matter what i do i can never use this version of modloader when the 1.2.5 version did work. By the way I have been using modloader and I tried to install it manually which did not work either. Yes i did delete META-INF. here is my error report: *** MagicMinecraftLauncher 0.9.8 ***
Disable inactive mods
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at magic.launcher.Launcher.main(Unknown Source)
Caused by: java.lang.VerifyError: (class: aho, method: <init> signature: ()V) Incompatible argument to function
at aif.<clinit>(SourceFile:149)
at axj.<init>(SourceFile:14)
at net.minecraft.client.Minecraft.<init>(SourceFile:128)
at anv.<init>(SourceFile:36)
at net.minecraft.client.MinecraftApplet.init(SourceFile:36)
at net.minecraft.client.Minecraft.main(SourceFile:1577)
... 5 more

Quote from ClumsyAssassin94

Minecraft has crashed!
----------------------
<SNIP>
- Minecraft Version: 1.3.1
<SNIP>
ModLoader 1.3.1

java.lang.VerifyError: (class: mod_MineColony, method: testBuilderInventory signature: ()V) Incompatible argument to function
<SNIP>

From the website "MineColony Rc19 for Minecraft 1.2.5"

Youre using an outdated mod, it wont work till the modder updates...

TG

Any Help? My Minecraft crashed.

Preliminary Updates? What?
*thump*
STUPID MOTH
GO DIE ON A LIGHT FIXTURE

I just downloaded modloader and it is coming up with this:

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; ModLoader has failed to initialize.
This error has been saved to C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2012-08-05_09.27.28-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

--- BEGIN ERROR REPORT 8cb1837b --------
Generated 5/08/12 9:27 AM
- Minecraft Version: 1.3.1
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_31, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 445985184 bytes (425 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- ModLoader: Mods loaded: 6
ModLoader 1.3.1
mod_PCcore 3.1 for 1.2.5
mod_DoggyTalents 1.2.5
mod_InvTweaks 1.41b (1.2.4)
mod_Timber 1.2.4
mod_PluginsforForestry 1.1

java.lang.NoSuchFieldError: E
at mod_PCcore.load(mod_PCcore.java:118)
at ModLoader.init(ModLoader.java:922)
at ModLoader.addAllRenderers(ModLoader.java:169)
at avx.<init>(RenderManager.java:86)
at avx.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 43c791ca ----------

Please help me out.