Linux – How to create LVM snapshot after the error message “not found: device not cleared”

I'm trying to test LVM, but I failed on first, potentially simple task – create a snapshot.

I have following situation:

root@debian:~# vgs
  VG   #PV #LV #SN Attr   VSize  VFree
  big    1   1   0 wz--n- 14.99g 5.68g
  fast   1   2   0 wz--n- 14.99g 4.75g

and

root@debian:~# lvs
  Internal error: Using string as sort value for numerical field.
  Internal error: Using string as sort value for numerical field.
  Internal error: Using string as sort value for numerical field.
  LV   VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  home big  -wi-ao--   9.31g                                           
  root fast -wi-ao--   9.31g                                           
  swap fast -wi-ao-- 952.00m                                           

I'd like to make test snapshot of home, so Figured this will be the command to use:

lvcreate --size 1G -n snap -s /dev/big/home

But it fails with:

/dev/big/snap: not found: device not cleared
Aborting. Failed to wipe snapshot exception store.

Well, obviously there is no /dev/big/snap – I didn't make the snapshot yet.

/dev/big contains only link to home:

root@debian:~# ls -l /dev/big/
total 0
lrwxrwxrwx 1 root root 7 Nov 28 18:09 home -> ../dm-2

What am I missing in here?