Invalid config Z-stick Gen5 on Mac OS

Hi,
I have the following setting on my configuration.yaml file:
zwave:
usb_path: /dev/cu.usbmodem1421

When I run hass --script check_config, it all appears fine, but on the home assistant page it says :

The following components and platforms could not be set up:
zwave
Please check your config

Any help will be appreciated, on how to setup the stick in Mac os.
Regards

Do you have the USB path indented two spaces?

Also confirm your zwave USB path is correct.

If it still won’t load please post your log contents here.