i cant get my person or my bug to come up from the ZBT tutorial. the code is as follows.

//This is a test world created by on .

mob

icon = 'person.dmi' //make it so all mobs will be created with the person icon
var
HP = 30

bug //new prototype
icon = 'bug.dmi' //override the parent's icon, which was 'person.dmi'


Login()
icon_state = gender //when a player logs in, make their icon's state
..() //the gender of their key. Then call the parent!


proc
DeathCheck() //checks to see if an attack is deadly
if (HP <= 0) //if the defender's HP is low enough...
world << "[src] dies!" //do the death messaging

verb
attack(mob/M as mob in oview(1)) //attack a mob within 1 tile of you
usr << "You attack [M]!" //send this message to the usr
oview() << "[usr] attacks [M]!" //send this message to everybody else
var/damage = rand(1,10) //assign a random # to a new variable
world << "[damage] damage!" //tell the damage to the world
M.HP -= damage //take away the damage from M
M.DeathCheck() //check for death with a proc

say(msg as text) //what the usr says is passed into "msg" as text
world << "[usr]: [msg]" //the world sees chatroom-like output


turf
grass //defines a "grass" prototype, which is a kind of turf...
icon = 'grass.dmi' //and has an icon named 'grass.dmi'. In single quotes!



world //we set one of our world's characteristics:
turf = /turf/grass //its default turf is the grass turf.




where is the place where i screwed up? i cant get the person i made or the bug to come up, all i get is the grass i made...