Questions:
I try run command: app/console cache:clear
This return me error:
An error occurred when executing the “‘cache:clear –no-warmup'” command:
PHP Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowable
Error: Fatal error: Class ‘DOMDocument’ not found in /var/www/html/vendor/s
ymfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php:52
Ubuntu 14.04 LTS
I use PHP 7 and install php5-dom not resolved my problem:
sudo apt-get install php5-dom
How to&Answers:
I had the same issue on Ubuntu and fixed it doing the following
apt-get install php-xml
or
sudo apt-get install php-xml
if not as root
Answer：
just a minor addition to the answer. i’m using nginx with php version 7 and php-fpm. you must restart the php-fpm service in order for the updates to work, restarting nginx alone won’t help
