code: def check_html_warnings(html, parser=None):
      
      if parser is None:
          parser = bs4.BeautifulSoup(html, 'html.parser')
  
      # Check warnings
      warnings = parser.find_all('div', {'class': 'service_msg_warning'})
      if warnings:
          raise VkPageWarningsError('; '.join([w.get_text() for w in warnings]))
      return True
docs: Check html warnings
  
      :param html: str: raw html text
      :param parser: bs4.BeautifulSoup: html parser
      :raise VkPageWarningsError: in case of found warnings