AutoIt FollowBot script

[Trequarta]

Hey guys i'm working on a Autoscript that you can run on a secondary computer to have a char follow you around as you kill stuff so he can get exp and spare room etc.
I got it working except when i get an error
D:\Scripts\Follower.au3 (3 : ==> Subscript used with non-Array variable.:
$x = Random($coord[0], $coord[0]+10, 1)
$x = Random($coord^ ERROR

$x = Random($coord[0], $coord[0]+5, 1)
$y = Random($coord[1], $coord[1]+5, 1)
How would I make them arrays?