dear, admin i got an error on my site error.log, i am using ojs302
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::checkFrequency() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php on line 315
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::_isInRange() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.inc.php on line 114
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::checkFrequency() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php on line 315
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::_isInRange() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.inc.php on line 114
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::checkFrequency() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php on line 315
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::_isInRange() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.inc.php on line 114
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::checkFrequency() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php on line 315
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::_isInRange() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.inc.php on line 114
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::checkFrequency() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php on line 315
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method ScheduledTaskHelper::_isInRange() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.inc.php on line 114
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method Request::getContext() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/plugins/ThemePlugin.inc.php on line 409
[14-Sep-2017 13:45:24 UTC] PHP Deprecated: Non-static method PKPRequest::_checkThis() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/classes/core/Request.inc.php on line 68
[14-Sep-2017 13:45:24 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
[14-Sep-2017 13:45:24 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
[14-Sep-2017 13:45:24 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
[14-Sep-2017 13:45:25 UTC] PHP Strict Standards: Declaration of PageHandler::authorize() should be compatible with PKPHandler::authorize($request, &$args, $roleAssignments, $enforceRestrictedSite = true) in /home/unipa486/public_html/ojtrans/lib/pkp/controllers/page/PageHandler.inc.php on line 19
[14-Sep-2017 13:45:25 UTC] PHP Deprecated: Non-static method Request::getContext() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/lib/pkp/classes/plugins/ThemePlugin.inc.php on line 409
[14-Sep-2017 13:45:25 UTC] PHP Deprecated: Non-static method PKPRequest::_checkThis() should not be called statically, assuming $this from incompatible context in /home/unipa486/public_html/ojtrans/classes/core/Request.inc.php on line 68
[14-Sep-2017 13:45:25 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getSeq() should be compatible with BlockPlugin::getSeq($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
[14-Sep-2017 13:45:25 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
[14-Sep-2017 13:45:25 UTC] PHP Strict Standards: Declaration of DevelopedByBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in /home/unipa486/public_html/ojtrans/plugins/blocks/developedBy/DevelopedByBlockPlugin.inc.php on line 20
what should i do can any one help . thanks