title: Flutter build iOS FAILED
body: <p>I build a new flutter project from VSCode, and run on iOS simulator (iphone 11), it shows:</p>
  
  <pre>
  Launching lib/main.dart on iPhone 11 in debug mode...
  Xcode build done.                                           11.2s
  Failed to build iOS app
  Error output from Xcode build:
  ↳
      ** BUILD FAILED **
  Xcode's output:
  ↳
      error: unable to spawn process (No such file or directory) (in target 'Runner' from project 'Runner')
      error: unable to spawn process (No such file or directory) (in target 'Runner' from project 'Runner')
      note: Using new build system
      note: Planning build
      note: Constructing build description
  Could not build the application for the simulator.
  Error launching application on iPhone 11.
  Exited (sigterm)
  </pre>