Hi, I have checked and I’m using Xcode 7.0.1 (7A1001).
I used Corona to build the IPA file to my hard drive, then manually use the Application loader - that’s where I get the error message (same today as yesterday).
I tried letting Corona build and send to store on its own, but unfortunately that gives me an error from Corona that I need to install “Standalone application loader” from appstore… however there is no standalone version on appstore, at least it’s not finding anything for me. And the error window in corona even gives a link to install it, but clicking on the link actually directly opens Application loader from my Xcode, and so I don’t get anywhere in the appstore 
anyway, I guess my only option is to try and upgrade Xcode to 7.1 - even if the 9.1 SDK is not yet supported by corona.
I’ll do the update tonight and see if that helps - will post results in a couple of hours.