I m Facing a Problem, Please help me

when i create my apk show this type error… someone help me…

Then you should look if you use a valid icon.

what you mens? valid icon?

Resolution: 256 x 256 pixel (or else)
Valid format: *.png

and say me what size kb?

I think that by meeting these requirements you have solved the problem. The size in Kb, I guess it will not influence, but it will be added to the size of the project what would limit it.