Please help! Encryption failed and flashing ROM doesn´t help :(

Hi,
please help I have xtresolite Rom installed and tried android encryption.

Phone went black and notification LED was flashing blue.

I forced a reboot and since then the phone boots with some default wallpaper and tells me: "Unfortunately, System UI has stopped."

Wiping and reflashing ROM has not helped.

Anyone got a hint?

thanks in advance