SetAsWallpaperActivity Does Not Exist | Error Message

[0QhukUm]

I keep getting this error message: 

"SetAsWallpaperActivity Does Not Exist"

everytime I try to use one of my wallpapers, but they were fine earlier this morning. Please help! 

[MrGhoul]

Try clearing the wallpaper app data. This will essentially reset the app.
1. Open Settings.
2. Select Apps
3. Tap the "three lines icon" and enable show system apps
4. Locate wallpapers & Styles or any variation that points toward the built-in service that deals with wallpapers. (Should be two wallpaper apps)
5. Open the apps
6. select Storage.
7. Clear data and restart your device