This error means your Android device doesn't have a Lock Screen Knowledge Factor (LSKF) set up - basically, no screen lock protection.

Quick fix:

Go to Settings → Security (or Lock Screen)

Set up a screen lock:

🔸 PIN

🔸 Pattern

🔸 Password

🔸 Fingerprint

🔸 Face unlock

Why does this happen?

Your app is trying to use Android's secure keystore, but the system requires some form of screen lock to protect the keys. Without it, Android won't let apps store sensitive data securely.

Steps:

Open Settings

Find "Security" or "Lock Screen"

Choose "Screen Lock"

Pick any method (PIN is quickest)

Restart your app

That should fix it. The keystore needs device security to work properly.