[Q] My lock screen does not work

It happened a couple of months back while I was on Sweet ROM (I forgot the version), I installed the BBM for Android (Official from the Play Store) then it suddenly crashed. When it crashed, it rebooted then I was stuck in Samsung bootloop. I waited a couple of minutes but to no avail, I have to reflash the ROM. When I reflashed Sweet, everything was okay but there was no lock screen. I tried locking it through the power menu but when I press it again, it just opens on the home screen. There's nothing. I tried face recognition, slide, pattern, and password but nothing worked.

Is there any way to fix this?

I've used widgetlocker for months but I'm still looking for the JB lockscreen.