Why does the error "Bad Request: wrong remote file id specified: Wrong padding in the string" occur?

Question

Python

Good afternoon!
I want to make the telegram bot download the file, work with it and send it ready in response.
This loop works for me 1 time, and gives the following error:

A request to the Telegram API was unsuccessful. The server returned HTTP 400 Bad Request. Response body:
[b'{"ok":false,"error_code":400,"description":"Bad Request: wrong remote file id specified: Wrong padding in the string"}']

Here is the code:

import telebot
import constant
bot = telebot.TeleBot(constant.API_TOKEN)

# Сохраняем присланый от пользователя файл
@bot.message_handler(content_types=['document'])
def handle_file(message):
    try:
        chat_id = message.chat.id
        file_info = bot.get_file(message.document.file_id)
        downloaded_file = bot.download_file(file_info.file_path)
        src = u'D:\\Python\\Bot\\' + message.document.file_name
        with open(src, 'wb') as new_file:
            new_file.write(downloaded_file)
        #import delete
        import tableTOtable
        bot.reply_to(message, 'Одну минуточку...')
        doc = open('D:\\Python\\Bot\\Счет-фактура.pdf', 'rb')
        bot.send_document(chat_id, doc)
        bot.send_document(chat_id, "FILEID")
    except Exception as e:
        bot.reply_to(message, e)
        import kill_procces
        import delete
bot.polling(none_stop=True, interval=0)

Maybe with an interval? Or help how to automatically restart the .py file after the loop. Thank you!