Root cause: java.lang.NoSuchMethodError: org.openqa.selenium.firefox.FirefoxDriver. Error

Trying to open Firefox to run a simple test case and I get the following error when I try to navigate to a URL:

Test Cases/Gaining Access/LogonAsUSER FAILED because (of) Unable to open browser with url: 'http://localhost/stock/' (Root cause: java.lang.NoSuchMethodError: org.openqa.selenium.firefox.FirefoxDriver.<init>(Lorg/openqa/selenium/firefox/FirefoxOptions;)V)
Works with Chrome :confused:

Hopefully something simple!

Which Firefox version you are using? I don’t observe that problem when using Firefox 56 or 57 with Katalon Studio 5.1 from my side, so I wonder maybe your Firefox is quite old?

v57.0 64 bit “Firefox Quantum”

Did a new install and this fixed it…timely reminder to RTFM and do what it says!!! o:)