Fatal error: Uncaught Error: Class "PKP\plugins\BlockPlugin" not found in C:\xampp\htdocs\journal\plugins\generic\announcementFeed\AnnouncementFeedBlockPlugin.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\journal\plugins\generic\announcementFeed\AnnouncementFeedBlockPlugin.php on line 19