Troubleshooting of selenium errors

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SeleniumHQ Browser Automation (php-webdriver/php-webdriver: PHP client for Selenium/WebDriver protocol. Previously facebook/php-webdriver)

How to tracking the selenium errors[edit]

  • Checking the standalone selenium server is running or not ps aux | grep selenium on Linux Os linux.png
  • Checking the log file of standalone selenium server e.g. launching the server by the command sudo nohup java -jar selenium-server-standalone-3.141.59.jar > /home/user/selenium.log 2>&1 &. The log file was located at /home/user/selenium.log
  • (optional) Checking the port where the selenium server is running e.g. wget http://localhost:4444
  • Checking the error log file of HTTP server e.g. sudo tail /var/log/nginx/error.log
  • (optional) Checking the error log file of PHP-FPM e.g. sudo tail /var/log/www.access.log which its file path defined in the configuration file /etc/php-fpm.d/www.conf

How to resolve Uncaught Facebook\WebDriver\Exception\InvalidSelectorException[edit]

Error message

PHP Fatal error:  Uncaught Facebook\WebDriver\Exception\InvalidSelectorException: invalid selector: The result of the xpath expression "xxx" is: [object Attr]. It should be an element.
  (Session info: chrome=83.0.4103.61) in /path/to/vendor/php-webdriver/webdriver/lib/Exception/WebDriverException.php:105


  • After the term was keyed in into the text box, the script shuld auto click the specified button which specified by XPath expression.

Possibile soultions

  • Solution1: Using headless chrome[1]
  • Solution2: Not click the button which specified by XPath expression. Send the ENTER to submit the form[2].

How to resolve [WARNING]: This version of ChromeDriver only supports Chrome version xx or [WARNING]: This version of ChromeDriver has not been tested with Chrome version 86[edit]


  • Download the same version of ChromeDriver with the version installed on the computer or server
  • You may need to stop the ChromeDriver in the process list if you could not overwrite the existing ChromeDriver file
    • Win Os windows.png (1) Open the command prompt with the administrative permission (2) and keyin taskkill /IM "chromedriver.exe" /F to stop the ChromeDriver process
    • Linux Os linux.png
  • Overwrite the existing ChromeDriver file


Troubleshooting of ...