That message comes when init cannot find the menuscript "select_and_boot_os.sh" from your CPIO.
Usually that means that you have managed to put in incompatible CPIO or corrupted the one you are loading....

What is your ubiboot version number?

If you cannot boot any OS now, what you should do is connect the USB cable to a computer and go to the ubiboot maintanance mode.
Then you can telnet to the device and check what is the state of the FS, and why the menuscript is not found.

As a temporary measure you can just flash a normal Harmattan Open Mode kernel (like the L2-fixed kenel, for example...)

If you do so, and manage to boot up Harmattan, please could you post your ubiboot.log file so I can check what is the cause of the problem?
On versions older than 0.3.5 the loaction is /var/log/ubiboot.log and on newer versions /home/user/MyDocs/ubiboot.log