[AP 4 Beta] Notifications page error

Opening the notifications page (https://www.example.com/forum/user/username/notifications/) on the user profile, I get the following error in the logs:

[14-Feb-2017 14:19:14 UTC] PHP Warning:  include(): Failed opening ‘…/plugins/anspress-4.0.0-beta.4/templates/addons/notification/php’ for inclusion (include_path=’.:/usr/share/php’) in …/plugins/anspress-4.0.0-beta.4/addons/free/notification/query.php on line 207

Screenshot from Query monitor: