Error

extends Node2D

var screen_size
var pad_size

var ball_speed = 80
var direction = Vector2(-1,0)
const PAD_SPEED = 150

func _ready():
    screen_size = get_viewport_rect().size
    pad_size = get_node("left").get_texture().get_size()
    set_process(true)
func _process(delta):
    var ball_pos = get_node("ball").get_pos()
    var left_rect = Rect2( get_node("left").get_pos() - pad_size/2, pad_size )
    var right_rect = Rect2( get_node("right").get_pos() - pad_size/2, pad_size )
    ball_pos+=direction*ball_speed*delta

    if ( (ball_pos.y<0 and direction.y <0) or (ball_pos.y>screen_size.y and direction.y>0)):
        direction.y = -direction.y
    if ( (left_rect.has_point(ball_pos) and direction.x < 0) or (right_rect.has_point(ball_pos) and direction.x > 0)):
        direction.x=-direction.x
        ball_speed*=1.1
        direction.y=randf()*2.0-1
        direction = direction.normalized()
    if (ball_pos.x<0 or ball_pos.x>screen_size.x):
        ball_pos=screen_size*0.5
        ball_speed=80
        direction=Vector2(-1,0)
    get_node("ball").set_pos(ball_pos)