zfs: dataset does not exist

I'm not able to set mountpoint to the pool.

# zpool import

   pool: wd-black
     id: 18120690490361195109
  state: ONLINE
 action: The pool can be imported using its name or numeric identifier.
 config:

        wd-black      ONLINE
          crypted-wd  ONLINE

Pool is normally visible and I'm able to import it into some direcotory. But I can't set nor get mountpoint:

# zfs set mountpoint=/ wd-black
cannot open 'wd-black': dataset does not exist

Can you say me why I have this issue?

Thank you in advance.

Solution 1:

Obviously, you didn't import the pool. Furthermore, I think you don't want to set a mountpoint to / unless you import the pool with -o altroot key.