TFS 1.X+ actions onUse

[roriscrave]

i use tfs 1.2, have an item, like a shovel, that i use-with and after i click on the monster, but i get error

function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    if target and target:isMonster() then
        print("is monster")
    end
 
    return true
end

Lua Script Error: [Action Interface]
data/actions/scripts/test.lua:onUse
data/actions/scripts/test.lua:4: attempt to call method 'isMonster' (a nil value)
stack traceback:
        [C]: in function 'isMonster'
        data/actions/script/stest.lua:4: in function <data/actions/scripts/test.lua:3>

If i use isCreature() i dont get error, why i cant check if is monster?
I need to check if target is a monster..

 

[roriscrave]

solved by @Apollos, only add function in lib:

function Item.isMonster(self)
    return false
end