Access error occurred when using firefox, in watir

-- binary=/usr/bin/firefox
-- port=4444
http://127.0.0.1:4444/session

< H1 > < Net::HTTPInternalServerError:0x00000001865438 > < / H1 >

/ var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok": Process unexpectedly closed with status 1 (Selenium::WebDriver::Error::UnknownError)

    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/response.rb:32:in `initialize"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/http/common.rb:84:in `new"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/http/common.rb:84:in `create_response"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/http/default.rb:106:in `request"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/http/common.rb:62:in `call"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/bridge.rb:164:in `execute"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/remote/bridge.rb:97:in `create_session"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/firefox/marionette/driver.rb:50:in `initialize"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/firefox/driver.rb:31:in `new"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/firefox/driver.rb:31:in `new"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver/common/driver.rb:52:in `for"
    from /var/lib/gems/2.3.0/gems/selenium-webdriver-3.13.0/lib/selenium/webdriver.rb:86:in `for"
    from /var/lib/gems/2.3.0/gems/watir-6.10.3/lib/watir/browser.rb:48:in `initialize"
    from firefox.rb:4:in `new"
    from firefox.rb:4:in `<main>"

The startup parameter of

geckodriver is-- binary=/usr/bin/firefox-- port=4444
geckodriver error return-sharp < Net::HTTPInternalServerError:0x00000001865438 >
selenium module accesses geckodiver"s http://127.0.0.1:4444/session