ios - Sketch + Xcode Launch Image -

i'm trying insert launch image in xcode project. have created image sketch 3 , exported in normal, @2x , @3x format, have checked dimensions required launch images here , match, apparently xcode doesn't want me insert them, because keeps showing me error every image:

are sketch 3 sizes wrong? should do?

the size correct - dragging appropriate bucket on images library? space in filename? try dragging images explicitly onto proper spot in launch image.

if don't have launch image yet on images.xcassets, can right-click , select "new launch image", generate this: http://prntscr.com/7qrom9