Why arent any pictures or videos visible in gallery, only in file manager? And all contacts deleted?

[Android Central Question]

I tried opening the playstore, but it wouldn't open, all I got was the "unfortunately, play store has stopped" pop-up. And it was all fine, all my pictures and videos were still in my gallery. Then about 10 minutes later, they started getting deleted out of my gallery, and are only visible in my file manager. Also, all my contacts and messages were deleted!! Please help!

 

[Rukbat]

Try restarting the phone.