I'm getting Error 257

The phone(bluetooth) could not find SmartEntry lock Please check/do following,

1. Ensure the SmartEntry lock is powered ON
2. Ensure that you're within bluetooth range(Approx. 10 feet)
3. If above two are true then turn off bluetooth from phone's settings and turn on. Try to operate now
4. If problem persist and you're Android phone user then please try this,
1. Go to Phone Settings > Apps & notifications > App info.
2. Tap on the 3-dot overflow menu on the top-right and tap on Show system.
3. Scroll down and Tap on “Bluetooth”.
4. Now, press “Storage” and select “CLEAR DATA”

If problem persist, please submit an issue(SmartEntry App-->Help--> Submit the issue)