# Troubleshooting common WebDriver errors

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❗You will not see the errors of you run the tests in Docker ❗

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### Error

unable to connect to chromedriver 127.0.0.1:9515 
(Selenium::WebDriver::Error::WebDriverError)

or

Selenium::WebDriver::Error::WebDriverError:
unable to connect to /Users/usr/.rbenv/versions/2.7.5/bin/chromedriver 127.0.0.1:9516

To fix:

1. Run`brew upgrade chromedriver` OR `brew install chromedriver`

2. You will see
Click “Cancel”

3. Go to System Preferences **>** Security & Privacy, under the General tab
Click “Allow anyway”

4. Run the test again
5. You will see
Click “Open”