Invalid Swift Support / invalid implementation of swift

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
Archive your build using Xcode->Product->Archive
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
Now upload this build using Application loader
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.