Error6 reports
Fix SessionNotCreatedException
in Selenium
✅ Solution
The SessionNotCreatedException in Selenium usually arises from a mismatch between the WebDriver version (e.g., ChromeDriver, EdgeDriver) and the browser version installed. To fix this, download the WebDriver version that corresponds to your current browser version from the official vendor website (e.g., ChromeDriver downloads for Chrome) and ensure it is accessible on your system's PATH, or specify the webdriver path when instantiating the webdriver in your code. Alternatively, use a WebDriver manager like WebDriverManager to automatically handle driver downloads and configuration.
Related Issues
Real GitHub issues where developers encountered this error:
[🐛 Bug]: [python] SessionNotCreatedException: Chrome instance exited — non-deterministic failure when creating a new ChromeDriver sessionMar 27, 2026
[🐛 Bug]: Selenium Grid Hub intermittently fails to create new sessions (HTTP 500): SequentialScheduler task rejected / ThreadPoolExecutor “Shutting down”Feb 3, 2026
[🐛 Bug]: Possile that Selenium Manager Might not be working as expectedJan 13, 2026
Timeline
First reported:Jun 26, 2025
Last reported:Mar 27, 2026