How to solve "Missing Marketing Icon. iOS Apps must include a 1024x1024px"

I was stuck at this problem for about 2 hours. I had a icon present in my icon list but it keeps on failing. The problem was that the PNG had alpha channel enabled. Open up photoshop and save your image without alhpa/transparency.

Solution found at: https://forums.developer.apple.com/thread/86829

For the XCode 9: we need to drag a new icon with size 1024pt new available icon item named "App Store iOS 1024pt" under AppIcon image set.

Make sure to use icon in PNG format without alpha/transparency. Thanks to @Hammoud for sharing transparency experience !

After doing this stuff, this warning should be gone and you should be able to see something like this.

Happy Coding !

Now onwards we need to add a new icon in our project with the size 1024X1024. Please see below-attached image. This issue was stared from WWDC 2017.

Note: - Do not upload or use the beta version (mac os or Xcode) for app upload. As per Apple recommendation. I already got mail from Apple about this.