Sketch + Xcode Launch Image

I'm trying to insert a launch image in my Xcode project. I have created the image with Sketch 3 and exported in normal, @2x and @3x format, i have also checked the dimensions required for the launch images here and they match, but apparently XCode doesn't want me to insert them, because keeps showing me this error for every image:

enter image description here

Are Sketch 3 sizes wrong? What should i do?

Solution

The size is correct - are you dragging it to the appropriate bucket on your images library? Also could be the space in the filename? Try dragging your images explicitly onto the proper spot in your launch image.

If you don't have a launch image yet on your Images.xcassets, you can right-click and select "New launch image", which will generate this: http://prntscr.com/7qrom9