nonexistent function but everything by tutorial

Question

everything is as it says in the title. I have no experience in creating an inventory and I found a video cycle with an explanation of what needs to be done. actually, the video itself is below. the problems start at 12: 15, because the code considers the pickupitem function non-existent when i'm trying to interact.
I'm sorry if this format of the question offends you, but I really can't find a solution. I will be glad of any help, have a good day
below will be the code and video itself

https://www.youtube.com/watch?v=ssYqIQQPt7A&t=843s

player (that one part):

func _input(event):
    if Input.is_action_just_pressed("takeitem"):
        if $itemdrop.itemsinrange.size() > 0:
            var pickitem = $itemdrop.itemsinrange.values()[0]
            pickitem.pick_up_item(self) #пофиксь пик ап итем пж, оно не видит функцию в сцене drop((((((
            $itemdrop.itemsinrange.erase(pickitem)

drop:

extends KinematicBody2D

const ACCELIRATION = 700
const MAX_SPEED = 95
var velocity = Vector2.ZERO

var itemname
var player = null
var being_picked_up = false

func _ready():
    itemname = "Монстро-конфета"

func _physics_process(delta):
    if being_picked_up == true:
        var direction = global_position.direction_to(player.global_position)
        velocity = velocity.move_toward(direction * MAX_SPEED, ACCELIRATION * delta)

        var distance = global_position.distance_to(player.global_position)
        if distance < 10:
            PlayerInv.add_item(itemname, 1)
            queue_free()
    velocity = move_and_slide(velocity, Vector2.UP)


func pick_up_item(body):
    player = body
    being_picked_up = true

Comments

Verify if the method exists in the object class by using the function below . The path to methods_log.txt file is printed at the end of this snippet.

Open the log.txt file with a text editor and see if the function is there. (Make sure your app is not running)

func _input(event):
    if Input.is_action_just_pressed("takeitem"):
        if $itemdrop.itemsinrange.size() > 0:
            var pickitem = $itemdrop.itemsinrange.values()[0]

            #### Code to list all methods of an object to a methods_log.txt file
                    methods_log(pickitem)
                    print("Logs dir:",OS.get_user_data_dir())   

            pickitem.pick_up_item(self) #пофиксь пик ап итем пж, оно не видит функцию в сцене drop((((((
            $itemdrop.itemsinrange.erase(pickitem)


func methods_log(obj):
    var methods: Array
    for m in obj.get_method_list():
        methods.append(m.name)
    methods.sort()

    var write_log = File.new()
    write_log.open("user://methods_log.txt", File.WRITE)
    write_log.store_line("Class:"+obj.get_class())
    for m in methods:
        write_log.store_line(m)
    write_log.close()

Answer 1

i would try it with the "_process(delta):" func instead of the _input func

Comments

it gives the same result(
and I noticed that any click on the "takeitem" button breaks the game
but still thanks for trying