Default [Q] Racing Bean 3.1 on Xperia Arc, only status 7

Hi guys, sorry for my Bad english at first.

I have a Xperia Arc (it15i), the Bootloader is unlocked, i'm using the Fusion 5.5 Kernel.
So i tried to install the Racing Bean Custom ROM 3.1.9(JB), But everytime i got the Error 7 code.

This Tutorial
"For people with "status 7" error:
Use flashtool and flash stock ICS (this cleans the "kernel partition") -> tried before only flashing the .587 kernel but did not work (must flash entire ROM)
Flash Fusion 4.0
Get in CWM (Vol down)
Wipe data
Wipe cache
Wipe Dalvik
Mounts and Storage format system
Mounts and Storage format cache
Mounts and Storage format data
Flash Racing Bean 2.0.1
Reboot", i tried so many times, but i got allways the same Error.
My Question on this Tutorial i had, after formating all of the Datas from the Smartphone i should do flash Racing bean, should i go out from the CWM and install the Correct kernel for the Custom ROM, but at this point i got the same Error.

I Downloaded the Custom ROM 3 times, but nothing helped. only the newer Version with Racing bean3.1.10 with is based on ICS worked on this phone, but this Laggs on my Phone, so i would hope some guys from you can help me to install this mod.

RaZ0rfail