You have to make sure that the Selenium libraries and Xebium are on the class path of the application started by FitNesse. Check the information under the "Tests Executed OK" button to see the actual command that has been executed (along with stdout/stderr).
> You received this message because you are subscribed to the Google Groups "Xebium" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to xebium+un...@googlegroups.com
> For more options, visit https://groups.google.com/d/optout
> <Screenshot at Jun 22 13-30-53.png>