My 'gallery' option does not open when I try to change my lockscreen..

[AC Question]

My phone's Lenovo A7000 with Android 6.0. I always changed my wallpaper by going to the Gallery App, selecting a pic and go to the option 'Set picture as'. After that it gives me 4 options of SET AS: Contact Photo, WhatsApp Profile Photo, Wallpaper, (Google Photos) Wallpaper. I always chose the 3rd option but now it's not opening.
Also, Settings > Lock Screen is not opening either.

Can you please help me???

 

[Tim1954]

Try wipe cache partition and reboot the device... That's the cure for most maladies like this...