I'm getting this error while trying to install customized Win 10 Pro 21H2 via BIOS mode only (UEFI works but need BIOS) on both a physical laptop (in legacy/BIOS mode) and in a VM. It occurs right after "Getting files ready for installation" completes.
I've attached a sanitized autounattend.xml of what the desired state should be. I've tried removing all locale info so that during setup manual selection of locale is required. I've also removed the disk wipe/partitioning so that is manual. All these changes result the same. I've also tested the vanilla installer straight from MS and it works fine installing via legacy/BIOS.
View attachment 6230
I've attached a sanitized autounattend.xml of what the desired state should be. I've tried removing all locale info so that during setup manual selection of locale is required. I've also removed the disk wipe/partitioning so that is manual. All these changes result the same. I've also tested the vanilla installer straight from MS and it works fine installing via legacy/BIOS.
View attachment 6230