Settings keeps 'stopping' when I try to change my lock pattern.

[AC Question]

I have Samsung Galaxy S6, I tried to change my lock screen from pattern to pin, and I got the 'unfortunately, Settings has stopped' message after I picked the pin. Now my phone is stuck on 'Swipe' and it will not let me change it, or add fingerprint. No matter what I try, it'll ask me for a pin, and when I enter it, I get the 'settings has stopped' message. I did restart and cleared settings cache. What can I do now?

 

[belodion]

Try Clear Credentials in Settings, Security.