Invalid Swift Support / invalid implementation of swift

1. Go to build settings and make flag Embedded Content Contains Swift Code -> YES, if your code contains partial swift code or entirely made in Swift
2. Archive your build using Xcode->Product->Archive
3. Export the Archive Build you will suddenly see the difference build size will be 40+ MBs this is because XCode has added SwiftSupport folder which was missing
4. Now upload this build using Application loader 
5. If this does not work check that if you have multiple XCode on your system goto Xcode->Preferences->Location->Command Lines Tools has the same latest or the same Xcode from drop down selected on which you have done the coding & vola it's done.