-Opened Shealth and configured.
-Do not open private mode or finger scanner. Do not try to configure these two.
-Root with CF root in odin.
-Open supersu. Update binary. Reboot. Disable knox.
-Install xposed 2.6.1. Install wanam xposed and go to security option. Disable knox and also disable secure storage. Reboot.
-Now configure private mode.
Tell me if it works for you.