Milight brightness

I’ve tried to implement this as well, but I’m getting an error -

Cannot determine item type of ‘officeVirtualLightON’ org.openhab.core.items.ItemNotFoundException: Item ‘officeVirtualLightON’ could not be found in the item registry7

Items (I’m not sure what is the function of the first labels in the definitions “Brightness” etc, I have tried with and without these) -

Switch officeMilight {milight=“mlbLounge;1”}
Switch officeMilightNight {milight=“mlbLounge;1;nightMode”}
Dimmer officeMilightBright “Brightness” {milight="mlbLounge;1;brightness}
Switch officeVirtualLightON “On/Off” {milight=“mlbLounge;1”}

sitemap -

Frame {
    Text label="Lights" icon="bulb" {
        Text label="Office" icon="bulb" {
            Switch item=officeMilight label="On/Off"
            Switch item=officeMilightNight label="Night Light"
            Switch item=officeVirtualLightON label="Brightness"
        }
    }
}

rules -

rule "Office Light On"
when
item officeVirtualLightON received command ON
then
sendCommand(officeMilightBright,100)
end

I’ve tried several variations of this configuration, the error persists.

Yes, saw your double plost, please avoid to do so.
I commented in your other post.

Apologies, I will continue on the other post