Composer install terminates with a fatal runtime exception

When I try to install the API on my server, I make it to parameter configuration, but soon after I get a fatal PHP error in Symfony.

> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache
PHP Fatal error:  Uncaught Error: Class 'DOMDocument' not found in /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php:52
Stack trace:
#0 /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(211): Symfony\Component\Config\Util\XmlUtils::loadFile('/var/www/ataras...', Array)
#1 /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(39): Symfony\Component\DependencyInjection\Loader\XmlFileLoader->parseFile('/var/www/ataras...')
#2 /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php(42): Symfony\Component\DependencyInjection\Loader\XmlFileLoader->load('web.xml')
#3 /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php(50): Symfony\Bundle\FrameworkBundle\DependencyInjection\FrameworkExtension->load(Array, Object(Symfony\Compon in /var/www/atarashii-api/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php on line 52
Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the post-install-cmd event terminated with an exception


  [RuntimeException]                                                         
  An error occurred when executing the "'cache:clear --no-warmup'" command.  


install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-plugins] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--] [<packages>]...

root@hatsune:/var/www/atarashii-api#

Below is my basic PHP information

phpinfo()
PHP Version => 7.0.4-7ubuntu2.1

System => Linux hatsune 4.2.6-1-pve #1 SMP Thu Jan 28 11:25:08 CET 2016 x86_64
Server API => Command Line Interface
Virtual Directory Support => disabled
Configuration File (php.ini) Path => /etc/php/7.0/cli
Loaded Configuration File => /etc/php/7.0/cli/php.ini

Am I doing something wrong? There's very little documentation for the installation procedure and requirements. (It essentially says to run composer install and not much else)

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