up waiting for root device.

[juan hernandez]

Hello i have karmic koala and when i turn on the machine show me this message:
gave up waiting for root device. Common problems: boot args ( cat
/proc/cmdline )
check rootdelay= (did the system wait long enough?)
check root=(did the system wait for the right device?
Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuidle6119541-b2c8-41f2-8930-246e98a92458 does not
exist. Dropping to a shell!
thank you in advance, grettings!