VMs not starting

I have the same problem, but it started after mistakenly removing NFSplugin.pm
I could not start VMs in the proxmox server again.

See attached error output.

I need help to resolve this problem
 

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I have fixed the problem by re-adding the NSFPlugin.pm
After which I ran the upgrade and that was all
 
In my case I think I updated via apt but did not reboot. Can this cause this much problems?
the upgraded KVM can set MSRs with the new kernel, the old kernel doesn't have the interface yet. When you upgrade to the new packages, but don't restart to activate the new kernel, you will be left in this state.