invalid get index 'receive damage' (on base: 'Staticbody3D').

hi so I was implementing a small part of the code into my game but now it has given me an error

Here is the code
`extends CharacterBody3D

const BASE_FOV = 100.0
const FOV_CHANGE = 3.5

var speed
var CROUCH_SPEED = 3
var crouch_speed = 3
const WALK_SPEED = 6.2
const SPRINT_SPEED = 8.0
const JUMP_VELOCITY = 5.5
const sensitvity = 0.01
const SPEED_SPRINT = 10.0
var default_height = 1.5
var crouch_height = 0.3
const bob_freq = 2.3
const bob_amp = 0.08
var t_bob = 0.0
var health = 200

#fov DONT TOUCH UNLESS NECCESARY
#load bullets
var instance

@onready var head = $Neck
@onready var camera = $Neck/Camera3D
@onready var collision = $CollisionShape3D
@onready var headbonker = $HeadBonker
@onready var Aimcast = $Neck/Camera3D/hand/AimCast
@onready var animshoot = $AnimationPlayer

Get the gravity from the project settings to be synced with RigidBody nodes.

var gravity = 9.8

func _enter_tree():
set_multiplayer_authority(name.to_int())

func _ready():
var player_controlled := is_multiplayer_authority()
camera.current = player_controlled
set_process_unhandled_input(player_controlled)
set_physics_process(player_controlled)

func _unhandled_input(event):
if not is_multiplayer_authority(): return
if event is InputEventMouseMotion:
head.rotate_y(-event.relative.x * sensitvity)
camera.rotate_x(-event.relative.y * sensitvity)
camera.rotation.x = clamp(camera.rotation.x, deg_to_rad(-40),deg_to_rad(60) )

if event is InputEventMouseButton:
	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
elif event.is_action_pressed("ui_cancel"):
	Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
	
if Input.is_action_just_pressed("fire"):
	if Aimcast.is_colliding():
		var hit_player = Aimcast.get_collider()
		print("hit enemey")
		hit_player.receive_damage.rpc_id(hit_player.get_multiplayer_authority())

func fire():
if Input.is_action_pressed("fire"):
if not animshoot.is_playing():
animshoot.play("Shoot")
else:
animshoot.stop()

func _physics_process(delta):
fire()

if Input.is_action_just_pressed("quit"):
	$"../".exit_game(name.to_int())
	get_tree().quit()



#print(stanima)
if not is_on_floor():
	velocity.y -= gravity * delta

if headbonker.is_colliding():
	collision.shape.height -= crouch_speed * delta 
	collision.shape.height = clamp(collision.shape.height, crouch_height, default_height)

# Handle jump.
if is_on_floor() or is_on_wall():			
	if Input.is_action_just_pressed("Jump"):
		velocity.y = JUMP_VELOCITY
	


if Input.is_action_pressed("sprint"):
	speed = SPRINT_SPEED
elif headbonker.is_colliding():
	speed = CROUCH_SPEED
else:
	speed = WALK_SPEED

if Input.is_action_pressed("crouch"):
	speed = CROUCH_SPEED
	collision.shape.height -= crouch_speed * delta 
else:
	collision.shape.height += crouch_speed * delta
	
collision.shape.height = clamp(collision.shape.height, crouch_height, default_height)



# 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", "back")
var direction = (head.transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
if is_on_floor():
	if direction:
		velocity.x = direction.x * speed
		velocity.z = direction.z * speed
	else:
		velocity.x = lerp(velocity.x, direction.x * speed, delta * 7.0)
		velocity.z = lerp(velocity.z, direction.z * speed, delta * 7.0)
	
else:
	velocity.x = lerp(velocity.x, direction.x * speed, delta * 2.0)
	velocity.z = lerp(velocity.z, direction.z * speed, delta * 2.0)

t_bob += delta * velocity.length() * float(is_on_floor())
camera.transform.origin = _headbob(t_bob)


#fov
var velocity_clamped = clamp(velocity.length(), 0.5, SPRINT_SPEED * 2)
var target_fov = BASE_FOV + FOV_CHANGE * velocity_clamped
camera.fov = lerp(camera.fov, target_fov, delta * 8)



move_and_slide()

func _headbob(time) -> Vector3:
var pos = Vector3.ZERO

pos.y = sin(time * bob_freq) * bob_amp 
pos.x = cos(time * bob_freq / 2) * bob_amp
return pos

@rpc("any_peer")
func receive_damage():
health -= 100
if health <= 0:
health = 200
position = Vector3.ZERO
`