You don't define locs under the objects like that. If it's a player, you'd want to put it under mob/Login. If it's not another human player, the easiest way is to just dump it on the map in the dmp editor, but if you want some kinda respawn system, you'd have to look at the New() procs.

So
mob/Skater/Login()
src.loc = locate(1,2,3)
..()

if it's a player.

and if it's not... uhh, this is just off the top of my head, but it'd probably look something like this.
world/New()
..()
var/mob/M = new mob/Skater
M.loc = locate(1,2,3)