Warning: require_once(mobile_device_detect.php): failed to open stream: No such file or directory in /home2/first12/public_html/index.php on line 1

Fatal error: require_once(): Failed opening required 'mobile_device_detect.php' (include_path='.:/opt/php54/lib/php') in /home2/first12/public_html/index.php on line 1