The problem can not be solved with xCode Upload Process. I was facing same issues few days ago when submitting few of my apps and all apps showing same error. After many tries, I used Application Loader to upload app and it worked.
- First go to xcode -> product menu -> archive
- Select Export for Appstore
- Save IPA file
- Now Open Application loader by going to xCode -> xCode Menu -> Open Developer Tool -> Application Loader
- Login with the credentials of account, and select the IPA file.
Submit it! It works!