Yeah I guess you have a way old version before he added the library. Import this first.
https://github.com/bptworld/Hubitat/raw/master/Bundles/NormalStuffLibrary.zip
Hopefully it does not blow up all your settings.
This is a similar app I used but if you already have watchdog setup it may be easier to just stick with it: [RELEASE] Device Activity Check - Get notifications for "inactive" devices
