I just updated xcode to 7.0 and fixed most of the bugs, but I keep getting this error message:The launch image set "LaunchImage" has 2 unassigned children. I already deleted the two unassigned children and still getting this error message.
6 Answers
Try to deep clean Xcode
(command+alt+shift+K)

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What does maj stand for? – Drew Bennett Sep 21 '15 at 13:06
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Sorry I'm french, it's actually shift – Loegic Sep 21 '15 at 13:07
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1Yeah it did. Thank you or Merci! – Drew Bennett Sep 21 '15 at 13:13
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I'm having the same problem (not on LaunchImage" but on assets used by the app. Deep clean didn't help. Xcode 7.1 beta – bshirley Sep 29 '15 at 15:49
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And make sure no required images are missing :) I had that issue as well. – Auri Rahimzadeh Jul 31 '19 at 01:45
If you click the problem , Xcode will lead you directly into the Images.xcassets , manually delete the two Unassigned images , rebuild it work fine for me.

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The deep clean didn't work for me. As trivial as it sounds, recreating the LaunchImages fixed the issue for me. I don't know why it happened in the first place, probably an Xcode 7 bug, but it works again.

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What you have to do is manually delete the two unassigned images, and then right click your image asset panes and choosing: App Icon & Launch Images > New iOS Launch Image. Once you click on that, a new set of launch image screen slots should populate. See the screenshot below for reference.

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In my case deep clean would not work until I manually deleted both unassigned images. For me the fix was a combination of all three answers above.

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Select the image. Open the attributes inspector and check that a device has been selected - i.e. all/universal. Then drag and drop the unassigned image into the appropriate image size.