Warning: require(/var/www/magento/vendor/symfony/polyfill-php70/bootstrap.php): failed to open stream: No such file or directory in /var/www/magento/vendor/composer/autoload_real.php on line 73

Fatal error: require(): Failed opening required '/var/www/magento/vendor/composer/../symfony/polyfill-php70/bootstrap.php' (include_path='/var/www/magento/vendor/magento/zendframework1/library:.:/usr/share/php') in /var/www/magento/vendor/composer/autoload_real.php on line 73