Selenium firefox driver session fails with : Could not start a new session. Response code 500. Message: Expected browser binary location, but unable to find binary in default location,
Error: With Firefox driver /gecko driver Could not start a new session. Response code 500. Message: Expected browser binary location, but unable to find binary in default location, Solution: This is due to if you are using set property with: "System.setProperty(" webdriver.gecko.driver ", "geckodriver.exe");" change to: System.setProperty(" webdriver.driver.gecko ", "C:\\geckodriver.exe" );