While uploading apple watch app, it need to have apple watch extension into embedded binary of iOS app. But if you are habbitat to delete derived data then xcode6 will delete that target. and when you submit it to apple it will only get ios app not apple watch app.enter image description here
Adding Embedded Binaries fails in Xcode Xcode won't link framework form separate project App crashes on device because of missing framework, works in simulator Overview
After deleting the "DerivedData" folder (or performing a "Product > Clean") in xcode6, I cannot add CocoaTouch frameworks from another project to the "Embedded Binary" section (under General tab).
Or, Xcode hits a linker error because it cannot find a framework that if previously could.
Other symptoms
Clicking on the + under "Embedded Binaries" shows the Framework selector but selecting a framework in different project in the workspace does nothing.