[Python] SessionNotCreatedException when launching Selenium ChromeDriver with FastAPI Slack...

I have a FastAPI server with a Slack chatbot that launches Selenium for automating certain tasks. However, I'm encountering an issue when initializing the ChromeDriver with the --user-data-dir argument:

user_data_dir = tempfile.mkdtemp()
chrome_options.add_argument(f"--user-data-dir={user_data_dir}")

# Initializing the driver
driver = webdriver.Chrome(options=chrome_options)


When I run this, it fails with the following error:

selenium.common.exceptions.SessionNotCreatedException: Message: session not created: probably user data directory is already in use, please specify a unique value for --user-data-dir argument, or don't use --user-data-dir


When I connect on ssh to the server it works without doing nothing.

I tried change the path:

chrome_options.add_argument("--user-data-dir=/home/ubuntu/mytmp/")


I tried static path

chrome_options.add_argument("--user-data-dir=/home/ubuntu/mytmp/")


And I have always the same behaviour.

I use AWS Lightsail with Ubuntu 22.04.5 LTS

Continue reading...