How to fix that camera doesnt work

[Danyal Assi]

Hello, camera isnt working at all and i dont know why
here's the whole code:

extends CharacterBody3D

@onready var armature = $Armature
@onready var spring_arm_pivot = $SrpingArmPivot
@onready var spring_arm = $SrpingArmPivot/SpringArm3D
@onready var anim_tree = $AnimationTree

const SPEED = 5.0
const LERP_VAL = .15

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

func _ready():
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _physics_process(delta):
	# Add the gravity.
	if not is_on_floor():
		velocity.y -= gravity * delta

func _unhandled_input(event):
	if Input.is_action_just_pressed("quit"):
		get_tree().quit()
	
	if event is InputEventMouseMotion:
		spring_arm_pivot.rotate_y(-event.relative.x * .005)
		spring_arm.rotate_x(-event.relative.y * .005)
		spring_arm.rotation.x = clamp(spring_arm.rotation.x, -PI/4, PI/4)

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var input_dir = Input.get_vector("left", "right", "forward", "backward")
	var direction = (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
	direction = direction.rotated(Vector3.UP, spring_arm_pivot.rotation.y)
	if direction:
		velocity.x = lerp(velocity.x, direction.x * SPEED, LERP_VAL)
		velocity.z = lerp(velocity.z, direction.z * SPEED, LERP_VAL)
		armature.rotation.y = lerp_angle(armature.rotation.y, atan2(-velocity.x,-velocity.z), LERP_VAL)
	else:
		velocity.x = lerp(velocity.x, 0.0, LERP_VAL)
		velocity.z = lerp(velocity.z, 0.0, LERP_VAL)


	anim_tree.set("parameters/BlendSpace1D/blend_position", velocity.length() / SPEED)

	move_and_slide()