When I run pub/index.php I get the following error: ``` Fatal error: Undefined class constant 'PUB_LIB_DIR' in /var/www/magento2/pub/index.php on line 33 ``` On line 33 of pub/index.php there is: ``` php $params[Filesystem::PARAM_APP_DIRS][Filesystem::PUB_LIB_DIR] = array('uri' => 'lib'); ``` And the constant Filesystem::PUB_LIB_DIR does not exist in Magento\Framework\App\Filesystem. So I think that line is not needed.