Godot Community

Already changed the Bounce to 1 but not work

what is the actually problem ?

extends CharacterBody3D

@onready var joystick = get_node("/Pop/HBoxContainer/Sprite2D/TouchScreenButton")

var move = Vector3(0,0,0)

func _physics_process(delta):
	move.x = joystick.x
	move.z = joystick.y
	player_movement(delta)

The line "var joystick = ..." is wrong . I google it and it says "null instance error" means Node not found . So the problem is the way of getting path . Try so many times . And can't figure it out .
Sometime it goes

Invalid get index 'x' (on base: 'null instance').

Advice? thx