Invalid Apple WatchKit support after submitting successfully to iTunes using xcode6.2

I created an iPhone app using xCode 6.1 and then iWatch and sent it using xCode 6.2, but after submitting successfully, when I check iTunes Connect, it shows Status: Invalid binary

and I get the following email from Apple:

Dear developer,

We have detected one or more problems with your recent delivery for "##". To process your delivery, the following must be corrected:

Invalid WatchKit support. The package includes an invalid WatchKit implementation. The app may have been built or signed with incompatible or pre-released tools. Visit developer.apple.com for more information.

Once these issues are fixed, you can re-add the fixed binary.

Hello,

App Store Team

How can I fix this?