Minimap blib icon error

whenever i play the game this error pops up;

IndexOutOfRangeException: Array index is out of range. EnemyAI.Update () (at Assets/Radar/EnemyAI.js:16)

var isChasing : boolean; var seeDistance : float = 50;

function Start () { } function Update () { var gos : GameObject[]; gos = GameObject.FindGameObjectsWithTag("MissionTrigger"); //assumes only one player var thePlayer:GameObject = gos[0]; var dist = Vector3.Distance(thePlayer.transform.position,transform.position);

if(dist<seeDistance){
    isChasing= true;
} else {
    isChasing=false;
}

} Please help !