How to resolve Kernel Panic error after upgrading F15 to F17 using Preupgrade?

How to resolve Kernel Panic error after upgrading F15 to F17 using Preupgrade?

I tried to upgrade my Fedora 15 to Fedora 17 directly using Preupgrade. Everything went smooth and the updates were installed. Grub2 screen came up after the restart. When I chose to boot F17, I got a kernel panic error.

Can somebody help me out with this?

Thanks

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