Can't modify variable from another gameobject script

Well, i just want to change to true a boolen on my player script from another script this is the way i tryed out:

(MAIN CLASS) player_behaviour pb = player[selected_char].gameObject.GetComponent(); pb.selected = true;

(PLAYER CLASS) public bool selected; void Start(){ selected = false; }

Of couse i apply this call much after of player script start function, thanks for you helping.