SessionNotCreatedException: This version of ChromeDriver only supports Chrome version 84 using ChromeDriver and Chrome through Selenium and Python

Question

I am using python 3 on windows 7, selenium, chromedriver version 84 (latest) to automate my chrome browser.

I am using this script:

Answer 1

This error message...

selenium.common.exceptions.SessionNotCreatedException: Message: session not created: This version of ChromeDriver only supports Chrome version 84

...implies that the ChromeDriver was unable to initiate/spawn a new Browsing Context i.e. Chrome Browser session.

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Analysis

Your main issue is the incompatibility between the version of the binaries you are using as follows:

• You are using chromedriver=84
• Release Notes of chromedriver=84 clearly mentions:

Supports Chrome version 84

• Presumably you are using chrome=83 the latest push for Chrome.

So there is a clear mismatch between ChromeDriver v84 and the Chrome Browser v83

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Solution

There are two (2) solutions to this issue.

• The easiest solution would be to download and start using chromedriver=83.0.4103.39
• If you want to continue with chromedriver=84 you have to download the latest Chromium binary from either of the official development repositories:
  • The Chromium Projects
  • chromium.appspot
  • Chrome Canary - Nightly build for developers

Additionally also ensure that:

• Selenium is upgraded to current levels Version 3.141.59.
• If your base Web Client version is too old, then uninstall it and install a recent GA and released version of Web Client.
• Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
• If your base Web Client version is too old, then uninstall it and install a recent GA and released version of Web Client.
• Take a System Reboot.
• Execute your @Test as non-root user.
• Always invoke driver.quit() within tearDown(){} method to close & destroy the WebDriver and Web Client instances gracefully.

Answer 2

Your ChromeDriver version and your installed version of Chrome need to match up. You are using ChromeDriver for Chrome version 84, which at the time of this answer, is a beta (non-stable) build of Chrome; you're probably not using it. Likely you're on version 83.

Check your Chrome version (Help -> About) and then find the correct ChromeDriver release. You could instead use webdriver-manager which can handle this for you.