[WARN] No /home/sankum/MagicMirror/modules/MMM-WallPaper/MMM-WallPaper.js found for module: MMM-WallPaper.

There is no module “MMM-WallPaper” (with a P instead of a p) on the module list. Please show what git remote -v outputs when you are in the module’s directory. Did you spell it right in your config file?

MMM-WallPaper

Is there a MMM-Wallpaper.js in the cd MagicMirror/modules/MMM-Wallpaper folder if so
try
sudo reboot
If not fixed, in the MagicMirror/modules folder use “rm -rf MMM-Wallpaper”
and try the
“git clone https://github.com/kolbyjack/MMM-Wallpaper.git”
again in the MagicMirror/modules folder.
do not forget to do the
cd MMM-Wallpaper
npm install
When it is finished loading.
if that fails you may have a faulty card.
I have had many fail me through out the years.
I went to a small external usb drive to get around that problem.
If none of this works let us know and maybe someone smarter than me will step in.

If this does work for you mark it solved please.