Warning: include_once(/includes/mysql.php): failed to open stream: No such file or directory in /usr/www/uoempirewebsite/UOEvolution/wiki/includes/WebStart.php on line 3

Warning: include_once(): Failed opening '/includes/mysql.php' for inclusion (include_path='.:/usr/share/php7:/usr/share/php') in /usr/www/uoempirewebsite/UOEvolution/wiki/includes/WebStart.php on line 3
MediaWiki API
<?xml version="1.0"?>
<api>
  <error code="internal_api_error_DBConnectionError" info="Exception Caught: DB connection error: MySQL functions missing, have you compiled PHP with the --with-mysql option?&#10;" xml:space="preserve" />
</api>