mount: you must specify the filesystem type

A Red Hat Enterprise Linux 6.2, when abnormal occurred, I input any command ,return bash Input/output error. It may filesystem error.
After reboot linux, it can not startup normally, the screen print:
mount: you must specify the filesystem type
mount: you must specify the filesystem type
mount: you must specify the filesystem type
........

Kernel - panic - not syncing: Attempted to kill init!

How can I debug this error and resolve this issue?

Thanks.

Chen Long