Hi

NarutoEnemy.tscn

@@ -7,6 +7,7 @@
 
 [node name="NarutoEnemy" type="Node2D"]
 script = ExtResource("1_y6vus")
+markerPointsParent = [null]
 
 [node name="StaticBody2D" type="StaticBody2D" parent="."]
 position = Vector2(460, 250)

Scripts/NarutoEnemy.gd

@@ -1,6 +1,6 @@
 extends Node2D
 
-export Node2D markerPointsParent = null
+@export var markerPointsParent = []
 # Called when the node enters the scene tree for the first time.
 func _ready():
 	pass # Replace with function body.