Fatal error: Uncaught Error: Class "PKP\form\Form" not found in C:\xampp\htdocs\journal\plugins\generic\announcementFeed\AnnouncementFeedSettingsForm.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\journal\plugins\generic\announcementFeed\AnnouncementFeedSettingsForm.php on line 20