A Rootfs problem

When I use mke2fs format a partition, then mount it, cause the following
error message:

 

VFS: Can't find ext3 filesystem on /dev/hda1.

VFS: Can't find an ext2 filesystem on /dev/hda1.

Unable ro identify CD-ROM format.

VFS: Can't find a romfs filesystem on dev hda1.

mount: Mounting /dev/hda1 on /root/map failed: Invalid argument.

 

Had I lost something in kernel configuration or RootFS??

 

Thanks,

JohnsonCheng