Hi Alec,
i am sorry, forgot to paste the stacktrace from error log.
below is what i have in error_log
[Wed Jul 29 06:53:15.086890 2020] [:error] [pid 90986] [client 128.14.133.58:45840] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 07:33:35.733000 2020] [:error] [pid 90988] [client 2.183.126.46:53781] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 07:41:13.458001 2020] [:error] [pid 90989] [client 191.100.10.34:46304] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 08:43:02.893206 2020] [:error] [pid 90989] [client 223.240.104.222:46865] script ‘/var/www/infoopen/public/index.php’ not found or unable to stat
[Wed Jul 29 08:43:03.430310 2020] [:error] [pid 95680] [client 223.240.104.222:46931] script ‘/var/www/infoopen/elrekt.php’ not found or unable to stat
[Wed Jul 29 08:43:03.704383 2020] [:error] [pid 90991] [client 223.240.104.222:46934] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 08:43:04.973812 2020] [:error] [pid 95682] [client 223.240.104.222:47081] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 09:47:32.534892 2020] [:error] [pid 90988] [client 104.244.78.107:57142] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374, referer: http://52.172.212.239:80/left.html
[Wed Jul 29 10:58:25.434940 2020] [:error] [pid 90990] [client 120.151.183.13:51739] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374
[Wed Jul 29 11:05:43.291838 2020] [:error] [pid 95680] [client 91.217.79.207:44436] PHP Parse error: syntax error, unexpected ‘?’, expecting variable (T_VARIABLE) in /var/www/infoopen/lib/pkp/classes/notification/PKPNotificationOperationManager.inc.php on line 374