Error:
Traceback (most recent call last):
  File "C:\Users\prince.bhatia\Desktop\Bihar_rera\Bihar_Rera.py", line 90, in <module>
    main()
  File "C:\Users\prince.bhatia\Desktop\Bihar_rera\Bihar_Rera.py", line 89, in main
    parsedata()
  File "C:\Users\prince.bhatia\Desktop\Bihar_rera\Bihar_Rera.py", line 80, in parsedata
    geta = i.find_elements_by_tag_name("a")[1]
  File "C:\Users\prince.bhatia\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 237, in find_elements_by_tag_name
    return self.find_elements(by=By.TAG_NAME, value=name)
  File "C:\Users\prince.bhatia\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 527, in find_elements
    {"using": by, "value": value})['value']
  File "C:\Users\prince.bhatia\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 493, in _execute
    return self._parent.execute(command, params)
  File "C:\Users\prince.bhatia\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 256, in execute
    self.error_handler.check_response(response)
  File "C:\Users\prince.bhatia\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 194, 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: chrome=67.0.3396.99)
  (Driver info: chromedriver=2.39.562718 (9a2698cba08cf5a471a29d30c8b3e12becabb0e9),platform=Windows NT 6.1.7601 SP1 x86_64)

from bs4 import BeautifulSoup
import requests
import csv
from selenium import webdriver
from selenium.webdriver.common import keys
from selenium.webdriver.support.ui import Select
import time
import functools
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions

url = "https://nagarseva.bihar.gov.in/rerabihar/ReraGetProjectStatus.aspx"
final_data = []

def writefiles(alldata, filename):
    with open ("./"+ filename, "w") as csvfile:
        csvfile = csv.writer(csvfile, delimiter=",")
        csvfile.writerow("")
        for i in range(0, len(alldata)):
            csvfile.writerow(alldata[i])


def getbyGet(url, values):
    res = requests.get(url, data=values)
    text = res.text
    return text

def parsedata():
    payload = {}
    global url, final_data
    data = getbyGet(url, {})
    soup = BeautifulSoup(data, "html.parser")
    #EVENTTARGET = soup.select("#__EVENTTARGET")[0]['value']
    EVENTVALIDATION = soup.select("#__EVENTVALIDATION")[0]['value']
    #print(EVENTVALIDATION)
    VIEWSTATE = soup.select("#__VIEWSTATE")[0]['value']
    #print(VIEWSTATE)
    #VIEWSTATEGENERATOR = soup.select("#__VIEWSTATEGENERATOR")[0]["value"]
    headers= {'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
              'Content-Type':'application/x-www-form-urlencoded',
              'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0'}

    formfields =  {"__EVENTARGUMENT":"PrintIndicator$0",
                   '__EVENTTARGET':"ctl00$ContentPlaceHolder1$GV_Building",
                   '__EVENTVALIDATION':EVENTVALIDATION,
                  #'__EVENTTARGET':EVENTTARGET,
                  '__VIEWSTATE':VIEWSTATE,
                  "__VIEWSTATEENCRYPTED":"",
                  "__VIEWSTATEGENERATOR":"CE676888",
                   }
    s = requests.session()
    res = s.post(url, data=formfields, headers=headers).text
    soup = BeautifulSoup(res, "html.parser")
    
    getdata = soup.find_all("div", {"class":"col-lg-8 col-md-8 text-left"})
    for i in getdata:
        datas = i.find_all("h4")
        for getspan in datas:
            Buildername = getspan.find_all("span")[2].text
            projectname = getspan.find_all("span")[3].text
        getp = i.find_all("p")
        for data in getp:
            address = data.find_all("span")[2].text
            area = data.find_all("span")[5].text
            district = data.find_all("span")[8].text
            stardate = data.find_all("span")[11].text
            enddate = data.find_all("span")[12].text
            status = data.find_all("span")[13].text
    
    driver = webdriver.Chrome("./chromedriver")
    driver.get('https://nagarseva.bihar.gov.in/rerabihar/ReraGetProjectStatus.aspx')
    d = driver.find_element_by_xpath('/html/body/form/div[3]/div[2]/table/tbody/tr/td/table/tbody/tr[1]/td[1]/div/table/tbody/tr[2]/td[3]/input')
    d.click()
    getclass = driver.find_elements_by_css_selector(".col-lg-3.col-md-3")
    for i in getclass:
        sublist = []
        time.sleep(2)
        geta = i.find_elements_by_tag_name("a")[1]
        geta.click()
        window_before = driver.window_handles[0]
        driver.switch_to_window(driver.window_handles[-1])
        d = driver.current_url
        print(d)
        sublist.append(d)
        driver.switch_to_window(window_before)
def main():
    parsedata()
main()

geta = i.find_elements_by_tag_name("a")[1]