Trying to add new enemy

Enemies/Ghost_Enemy.gd

@@ -0,0 +1,16 @@
+extends KinematicBody2D
+
+
+# Declare member variables here. Examples:
+# var a: int = 2
+# var b: String = "text"
+onready var animation_player: AnimationPlayer = get_node("AnimationPlayer")
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+    animation_player.play("appear")
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta: float) -> void:
+#  pass

Enemies/Ghost_Enemy.tscn

@@ -0,0 +1,38 @@
+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://Enemies/Ghost_Enemy.gd" type="Script" id=5]
+
+[sub_resource type="Animation" id=1]
+resource_name = "appear"
+tracks/0/type = "value"
+tracks/0/path = NodePath("Sprite:frame")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/keys = {
+"times": PoolRealArray(  ),
+"transitions": PoolRealArray(  ),
+"update": 1,
+"values": [  ]
+}
+
+[sub_resource type="Animation" id=3]
+resource_name = "idle"
+length = 4.0
+step = 0.6
+
+[sub_resource type="CircleShape2D" id=28]
+radius = 28.3009
+
+[node name="KinematicBody2D" type="KinematicBody2D"]
+script = ExtResource( 5 )
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+anims/appear = SubResource( 1 )
+anims/idle = SubResource( 3 )
+
+[node name="Sprite" type="Sprite" parent="."]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource( 28 )

Enemies/NightBourne.tscn

@@ -256,6 +256,6 @@ animations = [ {
 
 [node name="AnimatedSprite" type="AnimatedSprite" parent="."]
 frames = SubResource( 56 )
-animation = "attack"
-frame = 11
+animation = "running"
+frame = 4
 playing = true