If you have customized Nginx,
PHP on your server, you will have
to restart that service before it will function properly.
You can restart your services by SSHing in to your server as root
and running this command:
sudo service SERVICENAME restart
The service names are nginx-sp, apache-sp, and
phpX.Y-fpm-sp, where X.Y is the PHP version.
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if you can't find the answers to your questions.