flowvisor didn't show the slices that i create

So i was creating slice in flowvisor following the step i read on the book, by turn on the flowvisor and then use this code

$ fvctl -f /dev/null add-slice slice1 tcp:localhost:10001 admin@lowerslice1

but when run

$ fvctl -f /dev/null list-slices

it only shows fvadmin as the only slices

i already tried to run with

fvctl add-slice tenant1 tcp:localhost:10001 admin@tenant1

but the slices still only show fvadmin

what step should i do to show the slices that i made or how to make my slices appear?