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Flutter - Xcode 15 Build Sandbox Error Fix

October 18, 2023•Updated Feb 17, 2026

Error(Xcode): Sandbox: rsync.samba(22856) deny(1) file-write-create ~~~

Error(Xcode): Sandbox: dart(22836) deny(1) file-write-create ~~~

Error(Xcode): Flutter failed to write to a file at "~~".

This is because the Xcode 15 update introduced stricter sandboxing.

The fix is to either use the flutter command with the --output-dir flag or install the latest version of rsync.

In my case, I resolved it by upgrading the version:

  1. Install the latest version of rsync:
brew install rsync --HEAD
  1. Find the path to the rsync binary:
which rsync
  1. Replace the existing rsync with the new one:
sudo cp $(which rsync) /usr/local/Cellar/flutter/3.13.8/bin/rsync

This should resolve the sandbox issue.