Why can't my gallery generate thumbnails?

[AC Question]

why can't my gallery generate thumbnails

I deleted some apps from my Cubot p7 and soon after that any picture i take is blurred. When i try to check from gallery it says it can't generate thumbnails

 

[B. Diddy]

Re: why can't my gallery generate thumbnails

Welcome to Android Central! Which apps did you delete? Is the device rooted, and did you delete any system apps?