Guest Entries required fields fatal error I've built a comment system using Guest Entries. If I set fields to be required and don't fill them in in the front-end, I get the following error.

Fatal error: Class 'Craft\GuestEntriesEvent' not found in ****/craft/plugins/guestentries/controllers/GuestEntriesController.php on line 136

New entries are set to disabled by default, I have tried with all fields set to required, and with only certain fields set to required.
This has been fixed in Guest Entries 1.5.1.