Windows .jar Can't start 1.6 modpacks

[LordS3B]

Hello, this is my problem:
Every time I want to start a 1.6 modpack (Modpacks are installed) the game doesn't open.
Tried reinstalling, and didn't work
Here's my log paste:
http://pastebin.com/wQ4vEC85
In says a NullPointerException is causing that.

 

[lavarthan]

(La operación solicitada no se puede realizar en un archivo con una sección asignada a usuario abierta)

In any language the error is often caused by the same thing. It is usually an over zealous antivirus program. Try adding the folder, C:\Users\Caty\AppData\Roaming\ftblauncher, to the exclusion list of your antivirus program. Be sure to check any boxes that say 'include sub-folders' so it applies to the folders and files below it.