Try this, it fixed it for me. Open Terminal and run: cd ~ mv .itmstransporter/ .old_itmstransporter/ "/Applications/Xcode.app/Contents/Applications/Ap... ...
Try this, it fixed it for me. Open Terminal and run: cd ~ mv .itmstransporter/ .old_itmstransporter/ "/Applications/Xcode.app/Contents/Applications/Application Loader.app/Contents/itms/bin/iTMSTransporter" iTMSTransporter will then update itself, then you can try uploading in XCode again.