Lock screen not working

[Shraavan]

Hey guys,
My Windows 10 Lock screen is not working anymore.....
Everytime i change the lock screen, it is loading but lock screen is not changing.
My current lock screen is like this :

^^ PLZZ HELP!!

 

[davidhk129]

Just a suggestion ..........
Settings > personalization > left side, Background > right side, under Background heading, what does it say ?
If it says "solid color ", click the pointer and select Picture > then Choose your picture......

 

[davehc]

I think the background is for the desktop?
But. In the same path, what do you see in your selection under the lock screen heading.