Troubleshooting of selenium errors

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

How to resolve the selenium errors

• Checking the standalone selenium server is running or not ps aux | grep selenium on Linux
• 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
• (optional) Checking the keyboard event e.g. CTRL works on Win but not works on macOS

How to resolve Uncaught Facebook\WebDriver\Exception\InvalidSelectorException

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

Situation

• 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
• Solution2: Not click the button which specified by XPath expression. Send the ENTER to submit the form.

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

Situation: Updating the ChromeDriver

• Before Updating, If you encounter “file in use” errors:
  • Win Open Command Prompt as Administrator, Run command: taskkill /IM "chromedriver.exe" /F
• Two option to update the ChromeDriver
  • Option 1: Manual Download: Download ChromeDriver from ChromeDriver Downloads
  • Option 2: Package Managers: On macOS /Linux , use Homebrew. On Win , use Chocolatey.
• Ensure the version matches your installed Chrome browser. Replace the existing ChromeDriver file

How to resolve macOS says the *.app is damaged. What now?

Error message

“Google Chrome for Testing.app” is damaged and can’t be opened. You should move it to the Trash.

Solution

• Open the terminal, and key-in the following command:

xattr -cr 'Google Chrome for Testing.app'

References

Troubleshooting of ...

• Troubleshooting of Excel errors

• PHP, cUrl, Python, selenium, HTTP status code errors

• Database: SQL syntax debug, MySQL errors, MySQLTuner errors or PostgreSQL errors

• Troubleshooting of regular expression

• HTML/Javascript: Troubleshooting of javascript, XPath

• Software: Mediawiki, Docker, FTP problems, online conference software

• Test connectivity for the web service, Web Ping, Network problem, Web user behavior, Web scrape troubleshooting

Template

• Bug report template