What this error means
Each upload for a version needs a new, higher build number (CFBundleVersion). App Store Connect already has one with this number.
Why it happens
App Store Connect stores one binary per build number inside a version. Uploading the same CFBundleVersion again is treated as a duplicate.
The message tools print
ERROR ITMS-90189: "Redundant Binary Upload. You've already uploaded a build with build number '12' for version number '1.2.0'. Make sure you increment the build string before you upload your app to App Store Connect."How to fix it
- Raise the build number — for example the latest TestFlight build number plus one — and upload again.
- Automate it: fastlane’s latest_testflight_build_number with increment_build_number. CapWrapp bumps it on every ship.
Check a log that shows this
Paste the failing step into the build error explainer. It matches this message, and any others in the same log, in your browser. Nothing is uploaded.