Why can't I get the player global position on my enemy code on _physics_process?

renight0

Hello! I'm trying to set an enemy to follow my character but whenever I run the game I get "Invalid get index 'global_position' (on base: 'Nil'). error. No idea why.

The player and the enemy are different scenes that each have their own "player" and "enemy" node groups. And these scenes are instatiated in the game level scene

The enemy code starts with:

extends CharacterBody3D


const SPEED = 5.0
const JUMP_VELOCITY = 4.5

var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")

@onready var navigation_agent_3d = $NavigationAgent3D
var player: CharacterBody3D
var player_position: Vector3

func _ready():
	var player = get_tree().get_first_node_in_group("player")
	
func _physics_process(delta):
	
	player_position = player.global_position
	navigation_agent_3d.target_position = player_position
	var next_position : Vector3 = navigation_agent_3d.get_next_path_position()

(...)

I'm using Godot 4.2.2.Stable

Does anyone know what is wrong?

Jesusemora

renight0 this is simple:
godot lets you create local variables with the same name as previously defined variables.
you are doing just that, you are defining a variable player in the script:

var player: CharacterBody3D
var player_position: Vector3

and then you are defining the local variable player in ready:

func _ready():
	var player = get_tree().get_first_node_in_group("player")

player here exists as a local variable of ready. you should instead change the "global-ish" variable player that is already defined in the script:

func _ready():
	player = get_tree().get_first_node_in_group("player")

renight0

Jesusemora Thank you!! I'm a bit rusty with coding. Sorry for such a newbie question (I understand the local and global variables concept. My mind just pretended it did not see this local player variable x.x). It worked just fine now.