Kernel panic booting CentOS 5 image in VirtualBox

I'm using VirtualBox, and have a vdi. It works fine on the virtual machine I originally configured for it, but if I clone it (with VBoxManage clonehd) or just copy it, create a new VM and boot it, I always get the same errors:

mount: could not find filesystem '/dev/root'
...
Kernel panic - not syncing: Attempted to kill init!

Anyone know how I can fix this?

The VDI is an image of a clean system that I want to keep reusing to save me having to keep installing the OS into a new empty VDI.

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