Today I got this interesting error when deploying new VMs from a pre-defined template with customizations. Its basically failing on Setup is applying system settings part and to be precise on specialize pass of Microsoft-Windows-Shell-Setup of unattend.xml file.
Here is the screenshot:
At this point the only option is to press OK which will cause the VM to reboot, needless to say it will be constantly rebooting never taking you back to the actual login screen. Trick to get us out of this one is dating back to old XP days and SCCM troubleshooting during task sequence issues – press F8! You should now have nice cmd window, navigate to C:\Windows\Panther\UnattendGC and look for file called setuperr.log, use notepad to open it up.