Default [Q] Error when flashing custom ROM

I tryied to flash my phone with a custom firmware from eXistenZ v2 (http://forum.xda-developers.com/show...light=status+7) I followed many tutorials and in all cases I received an error Status 7 on Recovery mode. I followed this steps:

1- Flash device with 6.1.A.2.55 (Ive used LT26i_6.1.A.2.55_SG Generic (1257-6921) downloaded from http://www.xdafileserver.nl/index.ph...OCK+ROMS%2FICS)

2- Rebooted and works fine

3- Rooted device with Eroot 1.3.4 -> Ok!

4- Install CWN -> Ok!

5- Reboot device in Recovery mode

6- Try to install the ROM throught zip install on Recovery mode -> Error Status 7

Anyone can help me?