[Python] selenium working first for but not second. Element not found in cache - perhaps the...

I have asked about three question about this script in here. Several errors later I have got so far. I was trying to work my way around this script but I'm stuck at this part and don't know how to fix it.

Basically I would like to see unread messages on a website and answer it later. I'm stuck at the part I have a for loop checking for every unread messages and keeping the id of the conversation so I can use it later on the URL.

Here is the code:

#!/usr/bin/python
import time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import re

email = "xxx@gmail.com"
password = "xxxxx"

print "Openning Browser"
browser = webdriver.Firefox()
browser.get("https://olx.pt/account/?ref[0][action]=myaccount&ref[0][method]=index")
print "Logging into OLX"
elem = browser.find_element_by_name("login")
elem.send_keys(email)
elem = browser.find_element_by_name("login[password]")
elem.send_keys(password)
elem.send_keys(Keys.RETURN)
print "Loged into OLX"
time.sleep(5)
browser.get("https://olx.pt/myaccount/answers/")

while browser.find_elements_by_css_selector("tr.unreaded"):
print "Unreaded messages!"
unread_answers = browser.find_elements_by_css_selector("tr.unreaded")
for unread_row in unread_answers:
row_id = unread_row.get_attribute("id")
m = re.search('answer_row_(\d+)', row_id)
row_number = m.group(1)
print row_number
print "First loop"
browser.refresh()
time.sleep(5)
else:
print "All read!"


Here is the output:

Openning Browser
Logging into OLX
Loged into OLX
Unreaded messages!
315911723
First loop
Traceback (most recent call last):
File "loginolxbackup.py", line 28, in <module>
row_id = unread_row.get_attribute("id")
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 113, in get_attribute
resp = self._execute(Command.GET_ELEMENT_ATTRIBUTE, {'name': name})
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py", line 469, in _execute
return self._parent.execute(command, params)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 201, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: Element not found in the cache - perhaps the page has changed since it was looked up
Stacktrace:
at fxdriver.cache.getElementAt (resource://fxdriver/modules/web-element-cache.js:9407)
at Utils.getElementAt (file:///tmp/tmpvdAiKH/extensions/fxdriver@googlecode.com/components/command-processor.js:8992)
at WebElement.getElementAttribute (file:///tmp/tmpvdAiKH/extensions/fxdriver@googlecode.com/components/command-processor.js:12099)
at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpvdAiKH/extensions/fxdriver@googlecode.com/components/command-processor.js:12614)
at DelayedCommand.prototype.executeInternal_ (file:///tmp/tmpvdAiKH/extensions/fxdriver@googlecode.com/components/command-processor.js:12619)
at DelayedCommand.prototype.execute/< (file:///tmp/tmpvdAiKH/extensions/fxdriver@googlecode.com/components/command-processor.js:12561)


The html page I'm looking at is something like this:

<tr id="answer_row_3121238" class="bla bla bla">
...
<tr id="answer_row_3121428" class="bla bla bla">
...
<tr id="answer_row_3124238" class="bla bla bla">


I have tried printing out m and I saw it has 3 objects which mean it's fetching all of the unread messages.

I'm banging my head against the wall without any luck. Any advice/help would be much appreciated.

[url="https://stackoverflow.com/questions/35675053/selenium-working-first-for-but-not-second-element-not-found-in-cache-perhaps"]Continue reading...[/url]