I made a mistake in my guest, and therefore I tried to reuse my VM's backup (backup is automatically created: VM stopped, snapshot created, rsync, snapshot deleted VM restarted).
I unregistered the VM, copied the backup to my host, registered the VM, but to no avail. If I try to start it in headless mode, but I keep getting:
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$ vboxmanage startvm a4u-web --type headless
Waiting for VM "a4u-web" to power on...
VBoxManage: error: Incompatible configuration requested. (VERR_INCOMPATIBLE_CONFIG)
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ConsoleWrap, interface IConsole
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$ vboxmanage discardstate a4u-web
VBoxManage: error: Cannot delete the machine state as the machine is not in the saved state (machine state: PoweredOff)
VBoxManage: error: Details: code VBOX_E_INVALID_VM_STATE (0x80bb0002), component SessionMachine, interface IMachine, callee nsISupports
VBoxManage: error: Context: "DiscardSavedState(true )" at line 789 of file VBoxManageMisc.cpp