I want to add to my bot the ability to activate in a chat and have the bot immediately scan all the participants inside. As a result, the code gives an error and is not activated in the chat. Tell me what to do

below is the code and error

user_data = {}

with open('languages.json', 'r', encoding='utf-8') as file:
    translations = json.load(file)["translations"]

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    user_id = update.message.from_user.id
    if user_id not in user_data:
        user_data[user_id] = {
            'selected_artists': [],
            'language': 'ru'
        }
    await update.message.reply_text(get_translation(user_id, 'start'))

async def activate(update: Update, context: CallbackContext):
    chat_id = update.message.chat_id

    
    user_status = await context.bot.get_chat_member(chat_id, update.message.from_user.id)
    if user_status.status not in ['administrator', 'creator']:
        await update.message.reply_text("Only administrators can use this command.")
        return

    
    chat_members = await context.bot.get_chat_members(chat_id)

    
    if 'chat_users' not in user_data:
        user_data['chat_users'] = {}
    for member in chat_members:
        user_data['chat_users'][member.user.id] = chat_id

    await update.message.reply_text("Bot has been activated for all users in this chat.")

Error:

No error handlers are registered, logging exception.
Traceback (most recent call last):
  File "C:UsersDmitriAppDataLocalProgramsPythonPython312Libsite-packagestelegramext_application.py", line 1325, in process_update
    await coroutine
  File "C:UsersDmitriAppDataLocalProgramsPythonPython312Libsite-packagestelegramext_handlersbasehandler.py", line 157, in handle_update
    return await self.callback(update, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:UsersDmitriDesktoptelegrambotChartMakerTop.py", line 44, in activate
    chat_members = await context.bot.get_chat_members(chat_id)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'ExtBot' object has no attribute 'get_chat_members'. Did you mean: 'get_chat_member'?

I tried to fix it in other ways, but nothing worked. I want the bot to scan all chat users after the /activate command and save them in the user_data array