Написание кода в Godot Engine

extends CharacterBody2D

@export var speed : float = 150

@onready var animation_tree : AnimationTree = $AnimationTree

func _ready():
pass

func _process(_delta):
velocity = Vector2(Input.get_axis("left", "right"), Input.get_axis("up", "down")).normalized() * speed

if up_direction:
velocity = direction * speed

else:
velocity = Vector2.ZERO

move_and_slide()

func update_animation_paremeters():
if(velocity == Vector2.ZERO ):
animation_tree["paremeters/Idle/blend_position"] = true
animation_tree["paremeters/Walk/blend_position"] = false
else:
animation_tree["paremeters/Idle/blend_position"] = false
animation_tree["paremeters/Walk/blend_position"] = true Строка 14:Identifier "direction" not declared in the current scope. такая ошибка у меня не в первый раз возникает не магу понять что такое