Ошибка inconsistent use of tabs and space in indetation?

sti = open('static/welcome.webp', 'rb')
	bot.send_sticker(message.chat.id, sti)

   	<b>markup = types.ReplyKeyboardMarkup(resize_keyboard=True)</b>
   	item1 = types.KeyboardButton(" Рандомное число")
   	item2 = types.KeyboardButton(" Как дела?")
 
    markup.add(item1, item2)