I was too quick on this, Yes the site is open now, but when you click on View conference and want to login it gives you blank page and Logo file records errors, So the solution has not worked completely. I post the logo file, hopefully, you will have a solution for this, please.
[Mon Nov 26 08:00:08.401281 2018] [proxy_fcgi:error] [pid 7388] [client 103.253.148.23:38100] AH01071: Got error ‘PHP message: ocs2 has produced an error\n Message: WARNING: Declaration of Plugin::getSetting($conferenceId, $schedConfId, $name) should be compatible with PKPPlugin::getSetting($context, $name)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/classes/plugins/Plugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of Plugin::updateSetting($conferenceId, $schedConfId, $name, $value, $type = NULL) should be compatible with PKPPlugin::updateSetting($context, $name, $value, $type = NULL)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/classes/plugins/Plugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of CustomLocalePlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/customLocale/CustomLocalePlugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of TranslatorPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/translator/TranslatorPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of AcronPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/acron/AcronPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of PhpMyVisitesPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/phpMyVisites/PhpMyVisitesPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of AnnouncementFeedPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/announcementFeed/AnnouncementFeedPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of TinyMCEPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/tinymce/TinyMCEPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of GoogleAnalyticsPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/googleAnalytics/GoogleAnalyticsPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of IndexHandler::index($args) should be compatible with PKPHandler::index()\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/index/IndexHandler.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of ConferenceHandler::index($args) should be compatible with PKPHandler::index()\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/conference/ConferenceHandler.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: PHP Fatal error: Uncaught Error: Using $this when not in object context in /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/conference/ConferenceHandler.inc.php:34\nStack trace:\n#0 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/index/IndexHandler.inc.php(56): ConferenceHandler::index(Array)\n#1 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/PKPPageRouter.inc.php(177): IndexHandler->index(Array, Object(Request))\n#2 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/Dispatcher.inc.php(130): PKPPageRouter->route(Object(Request))\n#3 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/PKPApplication.inc.php(167): Dispatcher->dispatch(Object(Request))\n#4 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/index.php(65): PKPApplication->execute()\n#5 {main}\n thrown in /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.o…\n’, referer: Conference Portal
[Mon Nov 26 08:00:31.693861 2018] [proxy_fcgi:error] [pid 7392] [client 103.253.148.23:38102] AH01071: Got error 'PHP message: ocs2 has produced an error\n Message: WARNING: Declaration of Plugin::getSetting($conferenceId, $schedConfId, $name) should be compatible with PKPPlugin::getSetting($context, $name)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/classes/plugins/Plugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of Plugin::updateSetting($conferenceId, $schedConfId, $name, $value, $type = NULL) should be compatible with PKPPlugin::updateSetting($context, $name, $value, $type = NULL)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/classes/plugins/Plugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of CustomLocalePlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/customLocale/CustomLocalePlugin.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of TranslatorPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/translator/TranslatorPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of AcronPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/acron/AcronPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of PhpMyVisitesPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/phpMyVisites/PhpMyVisitesPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of AnnouncementFeedPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/announcementFeed/AnnouncementFeedPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of TinyMCEPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/tinymce/TinyMCEPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of GoogleAnalyticsPlugin::manage($verb, $args, &$message) should be compatible with PKPPlugin::manage($verb, $args)\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/plugins/generic/googleAnalytics/GoogleAnalyticsPlugin.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of IndexHandler::index($args) should be compatible with PKPHandler::index()\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/index/IndexHandler.inc.php\n At line: 20\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: ocs2 has produced an error\n Message: WARNING: Declaration of ConferenceHandler::index($args) should be compatible with PKPHandler::index()\n In file: /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/conference/ConferenceHandler.inc.php\n At line: 0\n Stacktrace: \n Server info:\n OS: Linux\n PHP Version: 7.0.30-0+deb9u1\n Apache Version: N/A\n DB Driver: mysqli\n DB server version: 10.1.26-MariaDB-0+deb9u1\nPHP message: PHP Fatal error: Uncaught Error: Using $this when not in object context in /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/conference/ConferenceHandler.inc.php:34\nStack trace:\n#0 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/pages/index/IndexHandler.inc.php(56): ConferenceHandler::index(Array)\n#1 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/PKPPageRouter.inc.php(177): IndexHandler->index(Array, Object(Request))\n#2 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/Dispatcher.inc.php(130): PKPPageRouter->route(Object(Request))\n#3 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/lib/pkp/classes/core/PKPApplication.inc.php(167): Dispatcher->dispatch(Object(Request))\n#4 /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.org/index.php(65): PKPApplication->execute()\n#5 {main}\n thrown in /var/www/vhosts/koyauniversity.org/conferences.koyauniversity.o...\n', referer: http://conferences.koyauniversity.org/index.php/index/index/index/index