I am testing out the addons I use and got this error for your addon.
I am using addon (v9.2.1)

2x Interface/AddOns/tullaRange/tullaRange.lua:230: hooksecurefunc(): PetActionButton_OnUpdate is not a function
[string "=[C]"]: in function hooksecurefunc' [string "@Interface/AddOns/tullaRange/tullaRange.lua"]:230: in function func'
[string "@Interface/AddOns/tullaRange/tullaRange.lua"]:75: in function <Interface/AddOns/tullaRange/tullaRange.lua:71>

Locals:

Not sure what else to submit for this report so feel free to ask for more info.
^_^