Osclass database is not available. Need more help?

Warning: DBConnectionClass::errorReport(): Couldn't fetch mysqli in /home/classifieds/pubhtml/oc-includes/osclass/classes/database/DBConnectionClass.php on line 182 Warning: DBConnectionClass::errorReport(): Couldn't fetch mysqli in /home/classifieds/pubhtml/oc-includes/osclass/classes/database/DBConnectionClass.php on line 183