Journal Setting Page Problem, not saving the new content

Dear Sir,
I am facing a problem with saving the new content on Journal setting page specially at “nasthead”. I am using 3.1.2.0 version and 7.2.24 PHP version.
----log error is—
[Fri Apr 23 15:37:30.498960 2021] [php7:warn] [pid 19331] [client 185.191.171.41:41804] PHP Warning: Declaration of DRIVERDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /var/www/jotitt/public_html/plugins/generic/driver/DRIVERDAO.inc.php on line 19
[Fri Apr 23 15:41:19.873653 2021] [php7:warn] [pid 19194] [client 34.243.4.47:33978] PHP Warning: Declaration of AddThisPlugin::register($category, $path) should be compatible with LazyLoadPlugin::register($category, $path, $mainContextId = NULL) in /var/www/jotitt/public_html/plugins/generic/addThis/AddThisPlugin.inc.php on line 0
[Fri Apr 23 15:41:19.877858 2021] [php7:warn] [pid 19194] [client 34.243.4.47:33978] PHP Warning: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /var/www/jotitt/public_html/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 0
[Fri Apr 23 15:41:19.878636 2021] [php7:warn] [pid 19194] [client 34.243.4.47:33978] PHP Warning: Declaration of DRIVERDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /var/www/jotitt/public_html/plugins/generic/driver/DRIVERDAO.inc.php on line 19
[Fri Apr 23 15:42:43.640801 2021] [php7:warn] [pid 18756] [client 40.77.167.36:8512] PHP Warning: Declaration of AddThisPlugin::register($category, $path) should be compatible with LazyLoadPlugin::register($category, $path, $mainContextId = NULL) in /var/www/jotitt/public_html/plugins/generic/addThis/AddThisPlugin.inc.php on line 0
[Fri Apr 23 15:42:43.645047 2021] [php7:warn] [pid 18756] [client 40.77.167.36:8512] PHP Warning: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /var/www/jotitt/public_html/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 0
[Fri Apr 23 15:42:43.645901 2021] [php7:warn] [pid 18756] [client 40.77.167.36:8512] PHP Warning: Declaration of DRIVERDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /var/www/jotitt/public_html/plugins/generic/driver/DRIVERDAO.inc.php on line 19
[Fri Apr 23 15:46:25.462860 2021] [php7:warn] [pid 19715] [client 66.249.64.90:39744] PHP Warning: Declaration of AddThisPlugin::register($category, $path) should be compatible with LazyLoadPlugin::register($category, $path, $mainContextId = NULL) in /var/www/jotitt/public_html/plugins/generic/addThis/AddThisPlugin.inc.php on line 0
[Fri Apr 23 15:46:25.467130 2021] [php7:warn] [pid 19715] [client 66.249.64.90:39744] PHP Warning: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /var/www/jotitt/public_html/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 0
[Fri Apr 23 15:46:25.467932 2021] [php7:warn] [pid 19715] [client 66.249.64.90:39744] PHP Warning: Declaration of DRIVERDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /var/www/jotitt/public_html/plugins/generic/driver/DRIVERDAO.inc.php on line 19

Please help in this matter
Kind regards
Sushil