Hi Folks: Just a person (not a company) trying to submit an app, developed with Xcode 5 to the App Store.
Developer.apple.com > IOS Dev Center > iTunes Connect
I faced same issue while I was updating my old application in iTunes Connect. I resolved that by putting some work by gone through some posts on web. We have one application in live store with one bundle id (com.sample.AppOne). We need to update the app to next version.
Then I gave bundle id as (com.sample.AppNine) which does not match with the bundle in iTunes Connect earlier. So while updating the app in iTunes Connect we should give same bundle id which we gave for old version.This solved my issue.