add child result as "First argument of yield() is null." error

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By yedamameday

im an a beginner dev still experiment on stuff. im trying to create a spawner using the position2d but some code result as “First argument of yield() is null.”. is there a way to fix this.
here is the pos2d code

extends Position2D

signal spawned(spawn)

export(PackedScene) var spawnling_scene
export var spawnrad = 100

func _on_EnemyTimer_timeout():
	var spawnling = spawnling_scene.instance()
	
	
	
	
	add_child(spawnling)
	spawnling.global_position = global_position
	return spawnling

and here is the enemy script

>    extends KinematicBody2D class_name Enemy
> 
> export var speed = 100
> 
> onready var enemy = get_node_or_null("/root/world/enemy") onready var
> player = get_node_or_null("/root/world/player") var velocity =
> Vector2.ZERO var path: Array = []	# contain destinations positions var
> nav = null var thereshold = 16
> 
> func _ready():
> 	yield(owner, "ready")
> 	nav = owner.nav
>func _physics_process(_delta)
> 	if path.size() > 0:
> 		move_to_target()
> 	look_at(player.global_position)
>func move_to_target():
> 	if
>              global_position.distance_to(path[0]) < thereshold:
> 		        path.remove(0)
> 	else:
> 		var direction = global_position.direction_to(path[0])
> 		velocity = direction * speed
> 		velocity = move_and_slide(velocity)
>func get_target_path(target_pos):
> 	path = nav.get_simple_path(global_position, target_pos, false)
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:bust_in_silhouette: Reply From: rossunger

It means that your enemy doesn’t have an “owner”. Do you want to yield to the parent nodes ready? In which case use get_parent() instead of owner