Error loading /config/configuration.yaml: Secret monitors_mute_state not defined

Hello Team,

I’m new users of Home Assistant ! I’m enjoy to use it !
For my first step I want to install this theme : matt8707/hass-config: A different take on designing a Lovelace UI

I have follow the instruction about this post by Mattias_Persson : A different take on designing a Lovelace UI - Share your Projects! - Home Assistant Community (home-assistant.io)(A different take on designing a Lovelace UI - #1717 by Mattias_Persson)

But finaly I have this error in my configuration.yaml and i don’t understand it.

Capture d’écran 2022-04-05 201646

Can you help me ?
Thanks team and enjoy the tech🤙

how did you fix this?