Thermostat card (template?) error

[Zingrock]

Can't figure out why the standard Thermostat card is throwing up an error n the UI.
Not very experienced with YAML but I've successfully got all other cards I've tried to work - I've literally copied and pasted the Usage code and only changed the entity and I'm receiving the following error:

ButtonCardJSTemplateError: TypeError: Cannot read properties of undefined (reading 'includes') in 'var areas =[]; if
(states[entity.entity_id].attributes.hvac_modes.includes("auto")) {...'

Might be something simple but I've tried it on a few different pages with different sensor entities and I get the same error.
I've checked the Template code for that card and it looks ok to my untrained eye and I can't imagine why I'd be getting an error if it works for everyone else.

Would appreciate some help thanks

[Zingrock]

Okay I've worked out what was going on, but will leave this here for anyone else.
I was trying to use a sensor entity, with a switch in the variables. Instead, I needed to create a climate entity using those components.

How to create a climate entity:
First (before we forget), add the following line to the configuration.yaml file:
climate: !include climate/generic_thermostat.yaml

Now to create the climate folder and entity:

• within the /config folder, create a folder called /climate
• within the /climate folder, create a file called generic_thermostat.yaml
• now use the following template with your own variables (up until target_sensor is mandatory, the rest are optional):
  i.e. https://www.home-assistant.io/integrations/generic_thermostat/

- platform: generic_thermostat
  name: cabin-climate
  heater: switch.sonoff_100144835b_1
  target_sensor: sensor.sml_t1_temperature