You might want to try and fix your VM manually. You need to boot from a live CD the resulting VM and enter rescue mode. Some instructions about the manual steps for RedHat are available here. Most likely there will be some differences in your case but it would still be useful for you. Given conversion has completed successfully and you have got up to the kernel panic error, this means the boot loader is installed successfully and most likely you would only need to potentially edit your fstab and rebuild the initrd image.
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