Hope this helps everyone. Sometimes an email message from itunesconnect@apple.com becomes stuck in your Junk mail folder. The email content in my case contained this message:
Dear developer,
We have discovered one or more issues with your recent delivery for "XXXYourAppName". To process your delivery, the following issues must be corrected:
Invalid Executable - The executable 'xxx.app/Frameworks/libswiftCoreMedia.dylib' contains bitcode.
I resolved this by searching my project and target build settings for Enable BITCODE and setting its value to NO
Then I uploaded the new binary and it was processed immediately.
If this does not work for you, please try some of the other solutions on this thread. If it does work for you, please mark the question answered so others will find the right solution.