Event ID - 40

Event Id40
SourceMicrosoft-Windows-Hyper-V-Hypervisor
DescriptionHyper-V launch failed; the Hyper-V image at %1%2 is revision %3, but the currently installed virtualization software only supports launching revision %4 Hyper-V images.
Event InformationAccording to Microsoft :
Cause
This event is logged when Hyper-V launch failed; the Hyper-V image is revision, but the currently installed virtualization software only supports launching revision Hyper-V images.
Reinstall Hyper-V
A possible security compromise has been created. Completely reimage the server (sometimes called a bare metal restoration), install a new operating system, and enable the Hyper-V role.
The hypervisor image is unavailable, corrupted, or an incompatible version. Reinstall the Hyper-V role.
Verify
Hypervisor successfully starts.
Reference LinksEvent ID 40 from Source Microsoft-Windows-Hyper-V-Hypervisor

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