Selenium does't work on Firefox 57 on php

First of all I have installed Selenium Server Standalone 3.9.1, XAMPP 3.2.2, php-webdriver 0.9.1 and Firefox 57 and I want to run the example.php file from the root of the selenium folder. This is the code:

require_once "phpwebdriver/WebDriver.php";

$webdriver = new WebDriver("localhost", "4444");
$webdriver->connect("firefox");
$webdriver->get("http://google.com");
$element = $webdriver->findElementBy(LocatorStrategy::name, "q");
if ($element) {
    $element->sendKeys(array("php webdriver" ) );
    $element->submit();
}

When I run this code on a chrome page, firefox is opened, google.com is opened and it stops, it doesn't do anything. It should search in google search bar for 'php webdriver' but it doesn't. I get the next notice on chrome page where I run this code:

Notice: Undefined property: stdClass::$ELEMENT in ...\WebDriver\phpwebdriver\WebElement.php on line 28

I've tried to:

• run the code with and without firefox version
• run the code with another browser (chrome) but there I get another error (Undefined property: stdClass::$sessionId)
• installed selenium server standalone 3.4.0

Nothing works! Can anyone help me with this problem?