grub2-probe - error - cannot find a GRUB drive

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"grub2-probe: error: cannot find a GRUB drive…"
What causes this, and why?

grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub.cfg ...
Found theme: /boot/grub2/themes/system/theme.txt
/usr/sbin/grub2-probe: error: cannot find a GRUB drive for /dev/vda2
/dev/vdb2.  Check your device.map.
Found linux image: /boot/vmlinuz-3.9.0-0.rc4.git0.1.fc20.i686.PAE
Found initrd image: /boot/initramfs-3.9.0-0.rc4.git0.1.fc20.i686.PAE.img
Found linux image: /boot/vmlinuz-0-rescue-e567d261136e65c44daec4be883d00f5
Found initrd image:
/boot/initramfs-0-rescue-e567d261136e65c44daec4be883d00f5.img
/usr/sbin/grub2-probe: error: cannot find a GRUB drive for /dev/vda2
/dev/vdb2.  Check your device.map.
done

/boot/grub2/device.map:
# this device map was generated by anaconda
(hd0)      /dev/vda
(hd1)      /dev/vdb
(hd2)      /dev/vda
(hd3)      /dev/vdb

/proc/mounts:
/dev/vda2 / btrfs rw,seclabel,relatime,compress=lzo,space_cache 0 0
/dev/vda2 /home btrfs rw,seclabel,relatime,compress=lzo,space_cache 0 0
/dev/vda2 /boot btrfs rw,seclabel,relatime,compress=lzo,space_cache 0 0

btrfs filesystem show
Label: 'fedora'  uuid: d5773e24-f14f-4d85-8fd3-b2b5457b4708
	Total devices 2 FS bytes used 3.61GB
	devid    2 size 18.03GB used 5.78GB path /dev/vdb2
	devid    1 size 18.03GB used 5.79GB path /dev/vda2

Btrfs v0.20-rc1

btrfs filesystem df /
Data, RAID1: total=5.00GB, used=3.35GB
System, RAID1: total=32.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=768.00MB, used=262.83MB


Thanks,
poma

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