Embedded Binary Validation Utility Error error: WatchKit apps must have a deployment target equal to iOS 8.2 (was 8.3)

Stack Overflow
Select your project settings and go to "TARGETS". Click on your Watch Kit App, select Build Settings. For the key "iOS Deployment Target" you should find "iOS 8.3". For some reason Xcode 6.3 Beta 4 wants to have this on "iOS 8.2" for "Debug" and "Release". Now your project should build as expected.