The pvmove command in test mode fails with : "Command failed with status code 5"

Issue

• The pvmove command in test mode fails with : "Command failed with status code 5"

  # pvscan
    PV /dev/mapper/mpath3p1   VG nfsVG   lvm2 [549.94 GB / 0    free]
    PV /dev/mapper/mpath3p2   VG nfsVG   lvm2 [49.97 GB / 0    free]
    PV /dev/mapper/mpath3p3   VG nfsVG   lvm2 [399.94 GB / 0    free]
    PV /dev/mapper/mpath3p4   VG nfsVG   lvm2 [599.97 GB / 7.75 GB free]
    PV /dev/mapper/mpath2p1   VG nfsVG   lvm2 [2.50 TB / 2.50 TB free]
    Total: 5 [2.06 TB] / in use: 5 [2.06 TB] / in no VG: 0 [0   ]
  
  # vgdisplay
    --- Volume group ---
    VG Name               nfsVG
    System ID             bbnfs1226701655
    Format                lvm2
    Metadata Areas        5
    Metadata Sequence No  10
    VG Access             read/write
    VG Status             resizable
    MAX LV                256
    Cur LV                1
    Open LV               1
    Max PV                256
    Cur PV                5
    Act PV                5
    VG Size               4.06 TB
    PE Size               32.00 MB
    Total PE              133113
    Alloc PE / Size       50946 / 1.55 TB
    Free  PE / Size       82167 / 2.51 TB
    VG UUID               SA5pHk-DjNb-3OaR-x2aZ-6S5i-LsDk-ad8lJ1
  
  
  [root@bbnfs ~]# pvmove -tv /dev/mapper/mpath3p2 /dev/mapper/mpath2p1
    Test mode: Metadata will NOT be updated.
      Finding volume group "nfsVG"
      Test mode: Skipping archiving of volume group.
      Creating logical volume pvmove0
      Moving 1599 extents of logical volume nfsVG/bbnfs
      Found volume group "nfsVG"
      Updating volume group metadata
      Test mode: Skipping volume group backup.
      Found volume group "nfsVG"
      Found volume group "nfsVG"
      Found volume group "nfsVG"
      Test mode: Wiping internal cache
      Wiping internal VG cache
    Command failed with status code 5.
  

• What does "Command failed with status code 5" at the end mean? What if the command is run without test mode.