セレンはテキストを印刷していません

クリックするようにプログラムされているリンクのタイトルを印刷しようとしています。困っています。しかし、私はエラーではなく何か他のものを受け取ります。はい、「テキスト」を試しましたが、実際にはエラーが発生します

Main.py

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import WebDriverWait
import unittest

class Test():
    def setUp(self):
        self.driver = webdriver.Chrome()
        self.driver.get("https://orlando.craigslist.org/search/apa?s=100")

    def task(self):
        driver = self.driver
        ln = driver.find_elements_by_xpath('//*[@id="sortable-results"]/ul/li/p/a')
        size = len(driver.find_elements_by_xpath('//*[@id="sortable-results"]/ul/li/p/a'))

        for i in range(0, size):
            ln = driver.find_elements_by_xpath('//*[@id="sortable-results"]/ul/li/p/a')
            ln = ln[i]
            ln.click()
            print (ln)

            back = driver.find_element_by_xpath('/html/body/section/header/nav/ul/li[3]/p/a').click()
            WebDriverWait(driver,3)
            if i == 5:
                break

    def getInfo(self,ln):
        driver = self.driver
        if ln:
            print (ln)
        else:
            print ("No listing name")


    def initialize():
        return Test

    def teardown(self):
        self.driver.quit()



run = Test()
run.setUp()
tas = run.task()
run.teardown()
WebDriverWait(tas,3)





if __name__ == '__main__':
    unittest.main()

これが私が得るものです

<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.47651721823993864-1")>
<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.8722193647053464-2")>
<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.7501031429429339-3")>
<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.1697348713718274-4")>
<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.8560861666106063-5")>
<selenium.webdriver.remote.webelement.WebElement (session="214c8aa4e4a919e11149b48fc1971ebf", element="0.8604981647081367-6")>

これがprint（ln.text）が私に与えるものです

Traceback (most recent call last):
  File "main.py", line 45, in <module>
    tas = run.task()
  File "main.py", line 20, in task
    print (ln.text)
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webelement.py", line 73, in text
    return self._execute(Command.GET_ELEMENT_TEXT)['value']
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webelement.py", line 491, in _execute
    return self._parent.execute(command, params)
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 238, in execute
    self.error_handler.check_response(response)
  File "/Library/Python/2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 193, 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=56.0.2924.87)
  (Driver info: chromedriver=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9),platform=Mac OS X 10.11.2 x86_64)