ReadyNAS Data Recovery - VMware recovery tool

hello everyone;
I am trying also to retrieve the data from a disk coming from my Ready NAS Duo with acmtn Debian release
my readynas duo was on RAID1 . can i use any of the disk ? cause one wont mount.



when i run the 1st terminal i got an error ; "mkdir: cannot create directory `/mnt/lvm': File exists"

vmw:/home/vmuser# modprobe fuse
vmw:/home/vmuser# vgscan
Reading all physical volumes. This may take a while...
Found volume group "c" using metadata type lvm2
Found volume group "vmw.debian5" using metadata type lvm2
vmw:/home/vmuser# vgchange -ay c
1 logical volume(s) in volume group "c" now active
vmw:/home/vmuser# mkdir /mnt/lvm
mkdir: cannot create directory `/mnt/lvm': File exists
vmw:/home/vmuser# ext2fuse /dev/c/c /mnt/lvm

why do i get this error ?
i m stock at this step...
PS i dont understand what Dekkit mean by (take note that your /dev/c may differ)

thx for your help.