I am using magic launcher.I install forge 4.0.0.204 first,then Flatlands Extension 1.4 and Optifine.

Edit 1:I am using Minecraft 1.3.2

This is the crash report:

 

 

 

      Minecraft has crashed!     

      ----------------------     

 

Minecraft has stopped running because it encountered a problem; Unexpected error

This error has been saved to C:\Users\asus k43u\AppData\Roaming\.minecraft\crash-reports\crash-2012-08-26_03.44.22-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

 

 

 

--- BEGIN ERROR REPORT 29e19a17 --------

Generated 8/26/12 3:44 AM

 

- Minecraft Version: 1.3.2

- Operating System: Windows 7 (amd64) version 6.1

- Java Version: 1.7.0_01, Oracle Corporation

- Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

- Memory: 1681523488 bytes (1603 MB) / 2058027008 bytes (1962 MB) up to 2058027008 bytes (1962 MB)

- JVM Flags: 2 total; -Xms2048m -Xmx2048m

- LWJGL: 2.4.2

- OpenGL: AMD Radeon HD 6320 Graphics GL version 4.2.11399 Compatibility Profile Context, ATI Technologies Inc.

- Is Modded: Definitely; 'forge,fml'

- Type: Client

- Texture Pack: Default

- Profiler Position: N/A (disabled)

 

java.lang.NoSuchMethodError: va.onGUICreateWorldPress()V

at aoo.a(GuiCreateWorld.java:241)

at apn.a(SourceFile:64)

at aoo.a(GuiCreateWorld.java:394)

at apn.d(SourceFile:112)

at apn.m(SourceFile:100)

at net.minecraft.client.Minecraft.l(Minecraft.java:1479)

at net.minecraft.client.Minecraft.J(Minecraft.java:831)

at net.minecraft.client.Minecraft.run(Minecraft.java:761)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 8a427346 ----------

 

But when i use Risugami's ModLoader,it works fine.

204 is far too ancient and has none of the ModLoader fixes.  Update to latest.

It appears that Flatlands Extension 1.4 is incompatible, as it edits base classes we cannot support it.

Tell the author to stop editing base classes and move to forge.

OK,thanks.