Work with TelegramBot

I want to add a telegram bot to my application. I am trying to get the chat id of all bot users. But there was an error in the function def get_chat_ids(token). Error: no implicit conversion of String into Integer My controller:

 require 'telegram/bot'
class BotsController < ApplicationController
    

  def client
    head :ok
    @bot_token=''
    chat_ids=get_chat_ids(@bot_token)

    bot=Telegram::Bot::Api.new(@bot_token)



    
    end

  def get_chat_ids(token)
    bot = Telegram::Bot::Api.new(token)
    updates = bot.get_updates
    chat_ids = updates['result'].map { |update| update['message']['chat']['id']}
    chat_ids
  end 
end`