AddFoodExhaustion

[tonibm19]

I want to make player's food bar be decreased on moving. I tried with this, but don't work.

Code:

function OnPlayerMoving(Player)
    Player:AddFoodExhaustion(1)
end

What's wrong? How can AddFoodExhaustion be used? If you can, add an explanation on the wiki.
I saw that in Player.cpp is used like this:

Code:

Player:AddFoodExhaustion(0.3f)

I tried with it but I get a malformed numbers error.