My jurnal system has produce error code like below
[Fri Apr 21 09:52:45 2017] [error] [client 175.111.89.10] ojs2 has produced an error\n Message: USER ERROR: name lookup timed out\n In file: /var/www/html/lib/pkp/classes/webservice/WebService.inc.php\n At line: 226\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 5.3.3\n Apache Version: Apache/2.2.15 (CentOS)\n DB Driver: mysql\n DB server version: 5.1.73, referer: https://jurnal.ugm.ac.id/jgki/issue/view/2273
Can anyone explain to me what I must to do to dissappear the error log above.