Can't Change Lockscreen

[RhyaSparkles]

Phone: LGL62VL
Problem: I can't change my lockscreen or homescreen wallpaper. I tried in my gallery and in the settings. The picture is in my internal storage. I've changed it before.
PS: I'd appreciate your help. Thanks.

 

[B. Diddy]

Welcome to Android Central! When you long-press an empty part of the homescreen and tap Wallpaper, does it give you the option to select from your Gallery? If so, what happens when you select your image? Does it give you an error message?