Unable to run virtual machine

[rodwilson]

Hi,
When trying to run a new installation of a virtual machine it fails to run and I get an error message.
See attached logs.
Any help would be appreacited.
Regards
Rodney

[mpack]

00:00:07.518881 !! VCPU0: Guru Meditation -4004 (VERR_VMX_INVALID_VMXON_PTR)

I believe this is a conflict with something else which is using VT-x/AMD-v. I don't see any sign that Hyper-v is present, so are you using any kind of third party AV product on this host?

[rodwilson]

OK I think I know what it was. I was running TwinCAT software on my machine which require VT-x to be enabled to work. If I restart ad run virtual box without opening TwinCAT it works fine. Once I run TwinCAT virtual box stops working.

[mpack]

Once I run TwinCAT virtual box stops working.

That would imply that, either some part of TwinCAT is still running, e.g. as a manually started service, or TwinCAT does not clean up after itself properly. If the latter then you should raise it as a support problem with Beckhoff/TwinCAT.

The latter option is more likely IMO. If TwinCAT was still running then the error I'd expect to see is "VT-x is not available".