[Libreboot] ERROR: device '/dev/matrix/root' not found. Skipping fsck

[Michael Bohn]

Hy All,

if I follow the howto "Installing Parabola GNU/Linux with full disk encryption" at 

 https://libreboot.org/docs/gnulinux/encrypted_parabola.html I 'm unable to boot the system.

Waiting 10 seconds for device /dev/matrix/root

ERROR: device '/dev/matrix/root' not found. Skipping fsck

ERROR: Unable to find root device '/dev/matrix/root'

Did body knows  what's the reason for this error ? 

Michael