yesterday I wanted to deploy some bugfixes for my app with Xcode 8.3, and ran while uploading into the error ITMS-90167: "No .app bundles found in the package". This error is also shown already when trying to validate. I did not change any code signing or mobile prov. files. Everything worked a month before. I tested my code with ios 11 device support copied over from xcode-beta.
I read through all stackoverflow questions like this one, but I am not using Xcode 7 nor the application loader.
So I updated to Xcode 9.0, fixed some stuff due to the changes for swift 3.2, cleaned derived data etc., and tried again but still the same error. Inside the ipa I can see the folder Payload/appname.app with its contents.
I am trying to deploy with fastlane, but also tried with Xcode, same results.
I have double checked code signing and recreated mobile provisioning profiles, revoked expired certificates and deleted duplicate/expired certs and keys in my keychain. Xcode shows the profiles as eligible. I also tried Automatically manage signing. But nothing helped.
What does this strange error message really mean? And how can one debug/resolve this?