Need a little help

[WitchahHuntah]

I am currently trying to learn how to mod civ for my rebalance mod, but I already have my first p big problem. I have this code

<GameInfo>
<Leaders>
        <Update>
        <Row>
            <ModifierId>TRAIT_COMBAT_BONUS_PER_LUXURY</ModifierId>
            <Name>Amount</Name>
            <Value>200</Value>
            </Row>
            </Update>
        </Leaders>
</GameInfo>

It won|t work in-game though, any ideas what I did wrong?

Edit The 200 is a placeholder because that is a faily obvious number