Need Help Unknown identifier

Was watching a Tutorial on creating an fps game and got an error
(Am Only A beginner)
Unknown Identifier “Damage Amount”

heres my script

var EnemyHealth : int = 10;

function Deduction (DamagedAmount : int) {
EnemyHealth -= DamageAmount;
}

function Update () {
if (EnemyHealth <= 0) {
Destroy(gameObject);
}
}

@Velgasta

Just fix your DamageAmount to Damage d Amount.
I mean make them identical.