Button navigation

Hi to all, I’m a little problem from 5 days, I try thousands time without win.
I want some button to open some card, for example I did a card called “Piano Terra”, i use this button
type: button
tap_action:
action: navigate
navigation_path: /lovelace/piano_terra
I know it’s very easy to do this, but where I wrong?
Thanks

Please format your CODE

look at could be your indenting try

type: button
tap_action:
  action: navigate
  navigation_path: /lovelace/piano_terra

It’s just formatted as you post.