PHP "Cannot unset string offsets" mink behat Selenium2Driver.php

Question

Started Selenium:

java -jar vendor\selenium\selenium-server-standalone-2.40.0.jar

Ran: php run.php Test.xlsx

Getting the following error:

Fatal error: Cannot unset string offsets in....src\Behat\Mink\Driver\Selenium2Driver.php on line 101

Inside run.php I have:

$driver = new \Behat\Mink\Driver\Selenium2Driver(
'firefox', 'base_url'

If I remove, base_url, I do not get an error and the tests run headless, no browser.

This works fine on another machine.

Thank you

Answer 1

The second param. is array of Capabilities for Selenium Driver (pass null if any) and the third param. is the base_url

$driver = new \Behat\Mink\Driver\Selenium2Driver(
'firefox', null,  'base_url');