Fatal Error when accessing journal

[nimulola]

When I wanted to download pdf from one of the published articles the page indicates Fatal Error.
Even when as Journal Manager I tried to login, the same message displays.

I am using
OJS 3.3.0-15

[Muhammad_Al_Madani]

Please read this:

Issue with IntlDateFormatter

I’ve recently started to experiment with OJS3.3.0-10 and noticed this error in the PHP error log: PHP Fatal error: Uncaught Error: Class ‘IntlDateFormatter’ not found in /var/www/ojs-3.3.0-10/lib/pkp/classes/notification/managerDelegate/EditorialReportNotificationManager.inc.php:158 Stack trace: #0 /var/www/ojs-3.3.0-10/lib/pkp/classes/notification/managerDelegate/EditorialReportNotificationManager.inc.php(86): EditorialReportNotificationManager->_getLocalizedMonthName() #1 /var/www/ojs-3.3…

You can also try downgrading the PHP version you are using to php7.4