VM fails to start with VERR_NEM_MISSING_KERNEL_API_2 when using Hyper-V => fixed in SVN/next 6.1.x maintenance release

[Wisent]

Error message: "VMMR0_DO_NEM_INIT_VM failed: VERR_NEM_MISSING_KERNEL_API_2 (VERR_NEM_MISSING_KERNEL_API_2).

VT-x is not available (VERR_VMX_NO_VMX).

Fehlercode: E_FAIL (0x80004005) Komponente: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}"

VirtualBox COM Server 6.1.12 r139181 win.amd64 (Jul 10 2020 22:02:01) OS Product: Windows 10 OS Release: 10.0.18363 Secure Boot: VERR_PRIVILEGE_NOT_HELD Host RAM: 16131MB (15.7GB) total ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={Saved screenshot data is not available (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37

It is independent of the created virtual machines like Ubuntu, Fedora etc.

In my opinion it is due to the VirtualBox Manager itself. The error describes that a session is already running and therefore cannot open another one. After installing and setting up the above mentioned virtual machines I closed the session and the VirtualBox Manager correctly.

When I completely uninstall VirtualBox Manger, everything runs without error message. When I log off or shut down the PC, I get the above error message.

I really hope there's a solution to this. Since I am still a beginner myself, I ask for detailed recommendations. Thank you.

[Wisent]

Component: VM control and not GUI

[Wisent]

Problem self solved. It was necessary to disable the Windows features [Windows Defender Application Guard] before installing Virtualbox because it also uses Hyper-V.

Replying to Wisent:

Error message: "VMMR0_DO_NEM_INIT_VM failed: VERR_NEM_MISSING_KERNEL_API_2 (VERR_NEM_MISSING_KERNEL_API_2).

VT-x is not available (VERR_VMX_NO_VMX).

Fehlercode: E_FAIL (0x80004005) Komponente: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}"

VirtualBox COM Server 6.1.12 r139181 win.amd64 (Jul 10 2020 22:02:01) OS Product: Windows 10 OS Release: 10.0.18363 Secure Boot: VERR_PRIVILEGE_NOT_HELD Host RAM: 16131MB (15.7GB) total ERROR [COM]: aRC=VBOX_E_IPRT_ERROR (0x80bb0005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={Saved screenshot data is not available (VERR_NOT_SUPPORTED)}, preserve=false aResultDetail=-37

It is independent of the created virtual machines like Ubuntu, Fedora etc.

In my opinion it is due to the VirtualBox Manager itself. The error describes that a session is already running and therefore cannot open another one. After installing and setting up the above mentioned virtual machines I closed the session and the VirtualBox Manager correctly.

When I completely uninstall VirtualBox Manger, everything runs without error message. When I log off or shut down the PC, I get the above error message.

I really hope there's a solution to this. Since I am still a beginner myself, I ask for detailed recommendations. Thank you.

[aeichner]

The VERR_NEM_MISSING_KERNEL_API_2 error when using Hyper-V should be fixed in the next maintenance release, please test the latest 6.1 test build from here.