Xcode 6 error: “Embedded binary's bundle identifier is not prefixed with the parent app's bundle identifier.”

Question

I\'m trying to build an extension project and Xcode keeps throwing the error in subject.

Answer 1

Make sure your:

Target App A -> Built Settings -> Code Signing -> Release

is the same with:

Target App A (Extension) -> Built Settings -> Code Signing -> Release

Answer 2

I was having the same problems. Changing the CFBundleIdentifier for my WatchKit extension to something other than the original value used when I first added the WatchKit extension and re-setting my shared app group entitlement fixed it for me.