Error -xcode- Target Release-unpack-ios Failed Exception Binary __top__ Online

The most frequent culprit is a corrupted intermediate binary in Xcode’s DerivedData directory. During a release build, Xcode caches compiled binaries to speed up subsequent builds. If an interruption (e.g., a system crash, full disk, or abrupt build cancellation) corrupts these cached binaries, the “unpack” phase finds a file that is not a valid binary format. Attempting to read it throws an exception. Solution: Clean the build folder ( Product > Clean Build Folder or delete DerivedData manually).

: If the ios/ folder itself is corrupted after an upgrade, some developers find success by deleting the folder and restoring it from a previous version or re-creating it with flutter create . (Note: This will overwrite manual changes like permissions in Info.plist ). Summary Checklist for Troubleshooting

This prevents the build from including Apple Silicon simulator binaries in your release archive.

: Ensure your user has full read/write access to the project directory.