Now you can rerun your tests. Make sure that you have working URL of your project in file acceptance.suite.yml, section WebDriver. For example http://localhost/yii-basic/web. It depends on your environment. Also specify browser. For me works well setting "browser: chrome".
If you receive error "WebDriver is not installed", you need to caall this composer command:
```php
composer require codeception/module-webdriver --dev
```