Submit an Article OJS 3.1.1-1 has a loading

I use OJS 3.1.1-1
When submitting a script, it is always loading and cannot proceed to the next stage, Submit an Article can only arrive at step 3 “Enter Metadata” and has a loading.
I am very grateful if given the solution

Message log error:
[06-Aug-2018 03:23:39 UTC] PHP Fatal error: require_once(): Failed opening required ‘/home/yapriaci/public_html/jurnal/lib/pkp/plugins/metadata/nlm30/filter/Nlm30CitationSchemaCitationAdapter.inc.php’ (include_path=’.:/home/yapriaci/public_html/jurnal/classes:/home/yapriaci/public_html/jurnal/pages:/home/yapriaci/public_html/jurnal/lib/pkp:/home/yapriaci/public_html/jurnal/lib/pkp/classes:/home/yapriaci/public_html/jurnal/lib/pkp/pages:/home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb:/home/yapriaci/public_html/jurnal/lib/pkp/lib/phputf8:/home/yapriaci/public_html/jurnal/lib/pkp/lib/pqp/classes:/home/yapriaci/public_html/jurnal/lib/pkp/lib/smarty:.:/opt/alt/php55/usr/share/pear:/opt/alt/php55/usr/share/php’) in /home/yapriaci/public_html/jurnal/lib/pkp/includes/functions.inc.php on line 25

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[06-Aug-2018 03:23:39 UTC] PHP Fatal error: require_once(): Failed opening required ‘/home/yapriaci/public_html/jurnal/lib/pkp/plugins/metadata/nlm30/filter/Nlm30CitationSchemaCitationAdapter.inc.php’ (include_path=’.:/home/yapriaci/public_html/jurnal/classes:/home/yapriaci/public_html/jurnal/pages:/home/yapriaci/public_html/jurnal/lib/pkp:/home/yapriaci/public_html/jurnal/lib/pkp/classes:/home/yapriaci/public_html/jurnal/lib/pkp/pages:/home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb:/home/yapriaci/public_html/jurnal/lib/pkp/lib/phputf8:/home/yapriaci/public_html/jurnal/lib/pkp/lib/pqp/classes:/home/yapriaci/public_html/jurnal/lib/pkp/lib/smarty:.:/opt/alt/php55/usr/share/pear:/opt/alt/php55/usr/share/php’) in /home/yapriaci/public_html/jurnal/lib/pkp/includes/functions.inc.php on line 25
[06-Aug-2018 03:24:30 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:30 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:24:31 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:24:31 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:31 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:24:31 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of IssueGridRow::initialize() should be compatible with GridRow::initialize($request, $template = NULL) in /home/yapriaci/public_html/jurnal/controllers/grid/issues/IssueGridRow.inc.php on line 130
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of IssueGridRow::initialize() should be compatible with GridRow::initialize($request, $template = NULL) in /home/yapriaci/public_html/jurnal/controllers/grid/issues/IssueGridRow.inc.php on line 130
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:24:31 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:24:31 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:04 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:04 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of SubmissionFileDAO::fromRow() should be compatible with PKPSubmissionFileDAO::fromRow($row, $fileImplementation) in /home/yapriaci/public_html/jurnal/classes/article/SubmissionFileDAO.inc.php on line 23
[06-Aug-2018 03:28:05 UTC] PHP Warning: mktime(): It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /home/yapriaci/public_html/jurnal/lib/pkp/lib/adodb/adodb-time.inc.php on line 1073
[06-Aug-2018 03:28:05 UTC] PHP Strict Standards: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/yapriaci/public_html/jurnal/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 0