So a little about what I did.

I went to https://addon.bool.no/ and put 2 lines in that I wanted to test out.

RegisterAttributeDriver(PlayerFrame, "state-visibility", "[combat][@target,exists]show;hide")
RegisterAttributeDriver(ObjectiveTrackerFrame, "state-visibility", "[group:party][raid]hide;show")

As you can see, the first line hides the player frame if no target or out of combat. The 2nd line hides the objective tracker if in a group or raid.

So far so good. It works fine on my hunter. *edit* also tested fine on my priest.

I logged over to my druid and I'm immediately presented with this error:

Message: Interface/FrameXML/ComboFramePlayer.lua:17: Usage: local power = UnitPower(unitToken [, powerType, unmodified])
Time: Mon Jan 30 17:01:46 2023
Count: 1
Stack: Interface/FrameXML/ComboFramePlayer.lua:17: Usage: local power = UnitPower(unitToken [, powerType, unmodified])
[string "=(tail call)"]: ?
[string "@Interface/AddOns/WagoAnalytics/WagoAnalytics.lua"]:72: in function <Interface/AddOns/WagoAnalytics/WagoAnalytics.lua:70>
[string "=[C]"]: ?
[string "=[C]"]: in function `UnitPower'
[string "@Interface/FrameXML/ComboFramePlayer.lua"]:17: in function `UpdatePower'
[string "@Interface/FrameXML/ClassPowerBar.lua"]:58: in function `OnEvent'
[string "@Interface/FrameXML/ClassResourceBarTemplate.lua"]:58: in function <Interface/FrameXML/ClassResourceBarTemplate.lua:38>

Locals: (*temporary) = <function> defined =[C]:-1

I thought ok, its mentioning "wago analytics" so I disabled that addon and still get this:

Message: Interface/FrameXML/ComboFramePlayer.lua:17: Usage: local power = UnitPower(unitToken [, powerType, unmodified])
Time: Mon Jan 30 17:03:08 2023
Count: 1
Stack: Interface/FrameXML/ComboFramePlayer.lua:17: Usage: local power = UnitPower(unitToken [, powerType, unmodified])
[string "=(tail call)"]: ?
[string "=[C]"]: ?
[string "=[C]"]: in function `UnitPower'
[string "@Interface/FrameXML/ComboFramePlayer.lua"]:17: in function `UpdatePower'
[string "@Interface/FrameXML/ClassPowerBar.lua"]:58: in function `OnEvent'
[string "@Interface/FrameXML/ClassResourceBarTemplate.lua"]:58: in function <Interface/FrameXML/ClassResourceBarTemplate.lua:38>

Locals: (*temporary) = <function> defined =[C]:-1

So I am at a loss. Any LUA gurus out there that can tell me whats going on or how to fix that?

*EDIT*

I seem to have fixed it by making it wait until player entered the world.

local EventFrame = CreateFrame("frame", "EventFrame")
EventFrame:RegisterEvent("PLAYER_ENTERING_WORLD")

EventFrame:SetScript("OnEvent", function(self, event, ...)
    if(event == "PLAYER_ENTERING_WORLD") then
      RegisterAttributeDriver(PlayerFrame, "state-visibility", "[combat][@target,exists]show;hide")
      RegisterAttributeDriver(ObjectiveTrackerFrame, "state-visibility", "[group:party][raid]hide;show")
    end
end)

Is this the best way to do this? Just looking for input from coding perspective. Trying to teach myself LUA coding on the fly here.