Unsupported version 6 of data unit 'hda' (VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION)

[Christoph_Koeln]

Hi everybody

After updating my iMac to OSX to 10.14.1 virtual box didn't start (known problem, see other threads)

So updated Virtual box to 5.2.22 with new GuestAdditions

After this VirtualBox starts without problems but starting the Gust machine (Windows 7) I receive an error massage
Translation: No new session could be started for virtual machine Windows 7
Unsupported version 6 of data unit 'hda' (instance #0 pass 0xffffffff) (VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION)
(see attachment)

Is there any way to get this running again or at least retrieve the data of the virtual disk?
Any help appreciated
Christoph

[mpack]

Saved state data is not guaranteed to be portable between hosts or even between VirtualBox versions. You are implicitly saying "there is no need to do a full boot since nothing has changed since last time". Except in this case it isn't true.

You should shut down VMs before upgrading VirtualBox or changing hosts. If you don't think you can remember then it would be better to shut down VMs every time, that's what I do and it only costs a few extra seconds.

The only cure now is to right click the VM and discard the saved state. The guest OS will act as if there had been a power cut.

[Christoph_Koeln]

So there is no way to retrieve the data of the virtual disk of the host system ?

As I'm on a business trip this week I will try discarding the saved state next Weekend.

[mpack]

The data on (virtual) disk has nothing to do with the saved state.

As I said, the result of this will be exactly the same as if your PC had a power cut. A power cut does not erase data already on your disks, though it may cause the loss of data in unsaved documents.

[Christoph_Koeln]

Thanks for your reply.
Christoph