Selenium Webdirver Error 가 해결이 되지 않습니다.

import telegram
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from pathos.multiprocessing import ProcessingPool as Pool
from datetime import datetime
import schedule
import time
import sys
from selenium.webdriver.support.ui import WebDriverWait

if __name__=='__main__':
options = webdriver.ChromeOptions()
options.add_argument("--headless") # Background(CLI) 동작 사용
options.add_argument("--no-sandbox")
options.add_argument('--disable-dev-shm-usage')
driver=webdriver.Chrome("C:\ChromeDriver\chromedriver.exe", options=options)

latest_num=0

token='1044075845:AAHB0zc0Nt9qY1HtIFTODpS3DP4Aay1qRys'
bot=telegram.Bot(token=token)

def post_mess(post_message, post_list):
for i in range(len(post_list)):
post=post_list[i] #i번째 post
print(post.text)
upload_date=post.find_element_by_xpath("//*[@id='content']/div[3]/div[2]/table/tbody/tr["+str(i+1)+"]/td[5]").text
print("upload_date is "+upload_date)
upload_date=datetime.strptime(upload_date, "%Y.%m.%d")
print(post.find_element_by_xpath("//*[@id='content']/div[3]/div[2]/table/tbody/tr["+str(i+1)+"]/td[2]"))

if (datetime.strptime("2020.05.04", "%Y.%m.%d")==upload_date):
title=post.find_element_by_xpath("//*[@id='content']/div[3]/div[2]/table/tbody/tr["+str(i+1)+"]/td[2]").text
print(title+"\n")
post.find_element_by_xpath("//td[2]/a").click() #제목 클릭

url=driver.current_url
print(url)
post_message+=("["+title+"]\n")
post_message+=("\t"+url+"\n\n")

driver.back()

time.sleep(3)

def crawling(driver, bot):
driver.get("http://www.bizinfo.go.kr/see/seea/selectSEEA100.do")

buiz_form_list=driver.find_elements_by_xpath("//*[@id='seea100VO']/fieldset/div[3]/div[2]/div[4]/ul//li")
for index, buiz_form in enumerate(buiz_form_list):
if index>=4:#1인기업부터
buiz_form.click() #클릭

driver.find_element_by_xpath("//*[@id='seea100VO']/fieldset/div[3]/div[3]/ul/li[2]/a").click() #검색클릭
post_list=driver.find_elements_by_xpath("//*[@id='content']/div[3]/div[2]/table/tbody//tr")

post_message=""

post_message=post_mess(post_message, post_list)

schedule.every(2000).seconds.do(crawling(driver,bot))

while(1):
schedule.run_pending()
time.sleep(2)

(중간에 질문과 상관 없는 코드는 삭제했습니다.)
이렇게 코드를 적었을 때

Traceback (most recent call last):
File "C:\Python\Python 3.8\Crawling\telegrambot_crawling_few.py", line 135, in <module>
schedule.every(2000).seconds.do(crawling(driver,bot))
File "C:\Python\Python 3.8\Crawling\telegrambot_crawling_few.py", line 99, in crawling
post_message=post_mess(post_message, post_list)
File "C:\Python\Python 3.8\Crawling\telegrambot_crawling_few.py", line 27, in post_mess
print(post.text)
File "C:\Python\Python 3.8\lib\site-packages\selenium\webdriver\remote\webelement.py", line 76, in text
return self._execute(Command.GET_ELEMENT_TEXT)['value']
File "C:\Python\Python 3.8\lib\site-packages\selenium\webdriver\remote\webelement.py", line 633, in _execute
return self._parent.execute(command, params)
File "C:\Python\Python 3.8\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
self.error_handler.check_response(response)
File "C:\Python\Python 3.8\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document
(Session info: headless chrome=81.0.4044.129)

이라고 오류가 뜹니다. 저는 이 에러가 page가 바뀌면서 새 driver가 오래된 element를 찾지 못해 발생하는 에러라고 알고 있는데요, driver.back()을 해도, time.sleep()을 해도 오류가 해결되지 않습니다...
도저히 알 수 없어 이렇게 질문 올립니다. 도와주시면 감사하겠습니다 ㅠㅠ

※사이트를 처음 이용하다 보니 코드를 어떻게 올려야 할지 모르겠군요. ㅎ..ㅠ