Can't get Started; FORGE DECOMPILE ERROR

[NujumKey]

I wanted to start modding minecraft w/forge, but every torturial i find fails with a similar error message, where i cant find the answer by just googling it.

 

So far;

 

I've extracted MCP into a folder (which i called "me modding")

 

Placed force updated Minecraft Bin and resources folder into the jars folder

 

Also dragged into the jars folder the minecraft server.jar for 1.3.2

 

dragged in the 'forge' folder from the forge source into the "me modding" folder

 

clicked install, it doesnt work

 

heres the log

 

==Decompiling client using Ferflower ==

> Creating SRGs

> Applying RetroGaurd

> Compiling AccessTransformer

> Compiling MCPMerger

> Running MCPMerger

Exception in thread "main" java.lang.IndexOutOf BoundsExeption: Index: 55, Size:54

              at java.util.ArrayList.rangeCheckForAdd(Unknown Source)

              at java.util.ArrayList.add(UnknownSource)

              at cpw.mods.fml.common.asm.transformers.MCPMerger.processFeilds(MCPMerger.java:442)

              at cpw.mods.fml.common.asm.transformers.MCPMerger.processClass<MCPMerger.java:358)

              at cpw.mods.fml.common.asm.transformers.MCPMerger.processJar(MCPMerger.java:197)

              at cpw.mods.fml.common.asm.transformers.MCPMerger.main(MCPMerger.java.87)

Decompile Exception: 1

 

And thats it.

 

I dont know how i can fix it

also yes, i just typed all that.

 

 

[LexManos]

You have modified jars, clean everything and try again.

[NujumKey]

your right,

i thought i had force updated, but it didnt work, i ended up backing up my saves and deleting the .minecraft folder i had.

 

But can i ask; how did you know what happened? It never said 'modded jar detected' or anything like that

[keepcalm]

Well the error tells you something (an array isn't the size that it's meant to be), and also, Lex is lex. He knows these things