flutter v1.9.1 Flutter.framework: Permission denied

    mkdir "${derived_dir}/engine"
    RunCommand cp -r -- "${flutter_podspec}" "${derived_dir}/engine"
    RunCommand cp -r -- "${flutter_framework}" "${derived_dir}/engine"
    RunCommand find "${derived_dir}/engine/Flutter.framework" -type f -exec chmod a-w "{}" \;
    # Make headers, plists, and modulemap files read-only to discourage editing.
    RunCommand find "${derived_dir}/engine/Flutter.framework" -type f \( -name '*.h' -o -name '*.modulemap' -o -name '*.plist' \) -exec chmod a-w "{}" \;
  else
    RunCommand rm -rf -- "${derived_dir}/Flutter.framework"
    RunCommand cp -r -- "${flutter_framework}" "${derived_dir}"
    RunCommand find "${derived_dir}/Flutter.framework" -type f -exec chmod a-w "{}" \;
    # Make headers, plists, and modulemap files read-only to discourage editing.
    RunCommand find "${derived_dir}/Flutter.framework" -type f \( -name '*.h' -o -name '*.modulemap' -o -name '*.plist' \) -exec chmod a-w "{}" \;
  fi

  RunCommand pushd "${project_path}" > /dev/null