vdostats command shows error - 'Could not find any VDO devices'

Issue

• The system has a device - /dev/testgv/testvdo:

  # lvs
    LV      VG     Attr       LSize    Pool  Origin Data%  Meta%  Move Log Cpy%Sync Convert
    lvol0   testgv twi-aotz--   <1.02g              0.00   11.04                           
    lvol1   testgv twi-aotz--  500.00m              2.14   10.94                           
    lvol2   testgv Vwi-a-tz--    1.02g lvol0        0.00                                   
    mylv1   testgv -wi-ao----  500.00m                                                     
    mylv2   testgv -wi-a----- 1000.00m                                                     
    testvdo testgv Vwi-aotz--    2.00g lvol1        0.52             <----------
  
  # df -h | egrep -i "size|testvdo"
  Filesystem                                           Size  Used Avail Use% Mounted on
  /dev/mapper/testgv-testvdo                           2.0G   47M  2.0G   3% /test_mnt
  

  But the vdostats command shows Could not find any VDO devices error:

  # vdostats
  vdostats: Could not find any VDO devices