Htmlunit error

[wyzls]

my code

session('htmlunit', array('javascriptEnabled' => true, 'version' => '3.6')); $session->open("https://github.com/element-34/php-webdriver"); $e = $session->elements('css selector', '.tabs li'); $this->assertEquals(count($e), 0); } } **i get this error** PHPWebDriver_UnhandledWebDriverError: The best matching driver provider org.openqa.selenium.opera.OperaDriver can't create a new driver instance for Capabilities [{browserName=htmlunit, javascriptEnabled=true, version=3.6, platform=ANY}] **question:** I should how to solve it??