Gatt Error message is a Bluetooth connection interruption. To fix this, you may do the following:
1. Please turn off then turn on the Bluetooth of your phone (Stop here if the issue has been resolved)
2. Uninstall and reinstall your Lockly lock (Stop here if the issue has been resolved)
3. Restart your phone (Stop here if the issue has been resolved)
4. Please reboot your Lockly lock. You will find a small pinhole on the exterior side of the lock between the two rounded terminals at the bottom of your Lockly lock. Kindly press it with a paperclip and hold for 5 seconds then let go. By this time, the screen should flash off and back on again.