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Warning: Use of undefined constant ABSPATH - assumed 'ABSPATH' (this will throw an Error in a future version of PHP) in /var/www/html/blog/wp-admin/includes/upgrade.php on line 17

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Fatal error: require_once(): Failed opening required 'ABSPATHwp-admin/includes/admin.php' (include_path='.:/usr/local/lib/php') in /var/www/html/blog/wp-admin/includes/upgrade.php on line 17