The application works correctly. There is no sign about notification errors on the Android phones. I have installed it on my phone and was able to synchronize it with the Google Calendar. I have created a close event and waited for notifications. All worked correctly. If you still have the software, backup or save anything you have saved then preform another installation through the Google Play application found on your phone.
For additional support from developers, use the following email address to contact it: cybilshock@gmail.com