Missing required icon file. The bundle does not contain

Open your project's General Preferences in Xcode, and make sure that your App Icons Source is the Asset Catalog named "AppIcon":

Then, in the project navigator, click Images.xcassets, click AppIcon, and then drag and drop your icons into the required places. If AppIcon is not shown, you'll have to right click and choose "New App Icon" and then select the proper icons from the inspector on the right:

Once you've done this, your icons should show up where they're supposed to.