System Monitor sensors no longer working 0.87.1

I’ve had this working for quite a while and rebuilt my system with 0.87.1
After restoring my config, etc. I am seeing this error :

    - platform: systemmonitor
        - type: memory_use_percent
        - type: processor_use
        - type: disk_use_percent
          arg: /home

I don’t find any reference to these sensors on the states page, so I am at a bit of a loss.
Running HassOS current release. Any ideas?

Fixed : Leaving the !include statement for my sensors out of my rebuilt configuration.yaml file was the root of the problem. Duh!