Hmm, I take that back. Apparently, it does take 2 arguments, but I have no idea what the second argument is supposed to do. Sure would be nice to have a modder's manual that explained some of this. :/
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The second argument is to choose which of the amount you consider.
The best would be to be able to set the number of argument where you define the liste of available funtions (const.txt)
The message you write is very clear, just the error is wrong.