The ability to use a nib or storyboard instead of a launch image is new in Xcode 6, but the view in your launch storyboard can't have outlets.
It seems that you have outlets in the file that is being used for your launch screen. Xcode 6 template projects will now create two files - main.storyboard and LaunchScreen.xib.
Either remove the outlets from LaunchScreen.xib or go to your target and remove the value from the "Launch Screen File" field -
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