How to use call_deferred() or set_deferred()

Hello, I need help, I didn't understand why there's error. godot v3.4.4. Thank you.

extends Area2D

onready var rock = preload("res://enemies_sprites/throw_goblin/rock_on_ground.tscn")

var player_position
var start_position
var arc_position
var t = 0

func _physics_process(delta):
	t += delta * 1

	_quadratic_bezier(start_position,arc_position,player_position,t)

func _quadratic_bezier(p0: Vector2, p1: Vector2, p2: Vector2, D: float):
	var q0 = p0.linear_interpolate(p1, D)
	var q1 = p1.linear_interpolate(p2, D)
	
	var r = q0.linear_interpolate(q1, D)
	
	position = r
	return r

func _on_rock_area_entered(area):
	if area.is_in_group("Player"):
	gone()

func _on_rock_body_entered(_body):
	gone()

func gone():
	var R = rock.instance()
	get_parent().add_child(R)
	queue_free()

`

E 0:00:07.122 body_set_shape_disabled: Can't change this state while flushing queries. Use call_deferred() or set_deferred() to change monitoring state instead.
<C++ Error> Condition "body->get_space() && flushing_queries" is true.
<C++ Source> servers/physics_2d/physics_2d_server_sw.cpp:652 @ body_set_shape_disabled()
<Stack Trace> rock.gd:33 @ gone()
rock.gd:29 @ _on_rock_body_entered()