Kernel Panic

#1: HDA NVidia at 0xfcffc000 irq 19
VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
[...]
Kernel panic - not syncing: VFS: unable to mount root fs unknown-block(0,0)
Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc7-LIBRE-g8a3017d #8
Call Trace:
panic+0xc1/0x1d0
mount_block_root+0x1fa/0x2ac
mount_root+0x57/0x5b
prepare_namespace+0x138/0x171
kernel_init_freeable+0x1bd/0x1c8
? do_early_param+0x8d/0x8d
? rest_init+0x90/0x90
kernel_init+0xe/0xf0
ret_from_fork+0x7c/0xb0
? rest_init+0x90/0x90