Unable to mount 6.0 TB Encrypted
Error unlocking /dev/sda1: Command-line `cryptsetup
luksOpen "/dev/sda1" "luks-backup"' exited with
non-zero exit status 5: Cannot use device /dev/sda1
which is in use (already mapped or mounted).

NAME                                          MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda                                             8:0    0  7.3T  0 disk
├─sda2                                          8:2    0  1.8T  0 part
│ └─luks-b6551dcf-40a3-404c-b6d1-c7c820922e1e 253:4    0  1.8T  0 crypt /media/kazwolfe/Desktop Files
└─sda1                                          8:1    0  5.5T  0 part
  └─luks-backup                               253:3    0  5.5T  0 crypt /media/kazwolfe/Backup