title: Flutter App - ERROR, Xcode **BUILD FAILED**
body: <p>Here's my terminal output:
  I have tried to update Xcode but i still get the same error. When i run flutter -doctor v it passes all cases, and theres a check-mark in every section. I have tried to build with AndroidStudio and then from the terminal and in both cases got the same error. AndroidStudio built with Nexus 6 API works fine, just having troubles with iOS building</p>
  
  <pre><code>~/Doc/FlutterLearn ❯  cd first_app                                 Py anaconda3
  ~/Doc/F/first_app ❯ c                                              Py anaconda3
  ~/Doc/F/first_app ❯ flutter run                                    Py anaconda3
  Launching lib/main.dart on iPhone 8 in debug mode...
  Running Xcode build...
   ├─Assembling Flutter resources...                           5.6s
   └─Compiling, linking and signing...                         5.0s
  Xcode build done.                                           12.4s
  Failed to build iOS app
  Error output from Xcode build:
  ↳
      ** BUILD FAILED **
  
  
  Xcode's output:
  ↳
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'Foundation' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIKit.h:8:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/Foundation.h:10:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/NSArray.h:109:12: error: attributes may not be specified
      on a category
      @interface NSArray&lt;ObjectType&gt; (NSArrayDiffing)
                 ^
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/NSArray.h:196:12: error: attributes may not be specified
      on a category
      @interface NSMutableArray&lt;ObjectType&gt; (NSMutableArrayDiffing)
                 ^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'Foundation' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIKit.h:8:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/Foundation.h:48:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/NSKeyValueCoding.h:8:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/NSOrderedSet.h:112:12: error: attributes may not be
      specified on a category
      @interface NSOrderedSet&lt;ObjectType&gt; (NSOrderedSetDiffing)
                 ^
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Foundatio
      n.framework/Headers/NSOrderedSet.h:187:12: error: attributes may not be
      specified on a category
      @interface NSMutableOrderedSet&lt;ObjectType&gt; (NSMutableOrderedSetDiffing)
                 ^
      4 errors generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      In file included from &lt;module-includes&gt;:1:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIKit.h:8:9: fatal error: could not build module 'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'QuartzCore' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIView.h:10:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/QuartzCore.h:9:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/CoreAnimation.h:10:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/CATransform3D.h:12:9: fatal error: could not build
      module 'Foundation'
      #import &lt;Foundation/NSValue.h&gt;
       ~~~~~~~^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'QuartzCore' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIView.h:10:
      While building module 'OpenGLES' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/CAEAGLLayer.h:7:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/OpenGLES.
      framework/Headers/EAGLDrawable.h:8:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/OpenGLES.
      framework/Headers/EAGL.h:8:10: fatal error: could not build module
      'Foundation'
      #include &lt;Foundation/Foundation.h&gt;
       ~~~~~~~~^
      1 error generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'QuartzCore' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIView.h:10:
      While building module 'Metal' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/CAMetalLayer.h:7:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Metal.fra
      mework/Headers/Metal.h:9:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Metal.fra
      mework/Headers/MTLTypes.h:8:9: fatal error: could not build module
      'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'QuartzCore' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIView.h:10:
      While building module 'Metal' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/QuartzCor
      e.framework/Headers/CAMetalLayer.h:7:
      While building module 'IOSurface' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/Metal.fra
      mework/Headers/MTLTexture.h:15:
      In file included from &lt;module-includes&gt;:3:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/IOSurface
      .framework/Headers/IOSurfaceObjC.h:15:9: fatal error: could not build module
      'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      1 error generated.
      2 errors generated.
      4 errors generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'CoreImage' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIColor.h:13:
      In file included from &lt;module-includes&gt;:1:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreImage
      .framework/Headers/CoreImage.h:9:9: fatal error: could not build module
      'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'CoreImage' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UIColor.h:13:
      While building module 'CoreVideo' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreImage
      .framework/Headers/CIImage.h:10:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreVideo
      .framework/Headers/CoreVideo.h:29:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreVideo
      .framework/Headers/CVPixelBuffer.h:462:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreVideo
      .framework/Headers/CVPixelBufferIOSurface.h:26:10: fatal error: could not
      build module 'IOSurface'
      #include &lt;IOSurface/IOSurfaceRef.h&gt;
       ~~~~~~~~^
      1 error generated.
      2 errors generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'FileProvider' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/NSFileProviderExtension.h:15:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/FileProvi
      der.framework/Headers/FileProvider.h:15:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/FileProvi
      der.framework/Headers/NSFileProviderDomain.h:8:9: fatal error: could not
      build module 'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      1 error generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'UIKit' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:
      While building module 'UserNotifications' imported from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UIKit.fra
      mework/Headers/UNNotificationResponse+UIKitAdditions.h:10:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UserNotif
      ications.framework/Headers/UserNotifications.h:8:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/UserNotif
      ications.framework/Headers/NSString+UserNotifications.h:8:9: fatal error:
      could not build module 'Foundation'
      #import &lt;Foundation/Foundation.h&gt;
       ~~~~~~~^
      1 error generated.
      13 errors generated.
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/Flutter.h:54:
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterAppDelegate.h:8:9: fatal error: could not build module
      'UIKit'
      #import &lt;UIKit/UIKit.h&gt;
       ~~~~~~~^
      While building module 'Flutter' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:
      While building module 'CoreMedia' imported from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Flutter/Flutter.framework/
      Headers/FlutterTexture.h:8:
      In file included from &lt;module-includes&gt;:1:
      In file included from
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreMedia
      .framework/Headers/CoreMedia.h:15:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platfor
      m/Developer/SDKs/iPhoneSimulator13.0.sdk/System/Library/Frameworks/CoreMedia
      .framework/Headers/CMFormatDescription.h:29:10: fatal error: could not build
      module 'CoreVideo'
      #include &lt;CoreVideo/CoreVideo.h&gt;
       ~~~~~~~~^
      1 error generated.
      15 errors generated.
      In file included from
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.m:5:
      /Users/snak3/Documents/FlutterLearn/first_app/ios/Runner/GeneratedPluginRegi
      strant.h:8:9: fatal error: could not build module 'Flutter'
      #import &lt;Flutter/Flutter.h&gt;
       ~~~~~~~^
      16 errors generated.
      note: Using new build systemnote: Planning buildnote: Constructing build
      description
  
  Could not build the application for the simulator.
  Error launching application on iPhone 8.
  ~/Doc/F/first_app ❯  
  
                                   took 24s Py anaconda3
  </code></pre>
  
  <p>Here's the output from flutter doctor :</p>
  
  <pre><code>~ ❯ flutter doctor -v                                                                  Py anaconda3
  [✓] Flutter (Channel stable, v1.9.1+hotfix.6, on Mac OS X 10.14.6 18G95, locale en-CA)
      • Flutter version 1.9.1+hotfix.6 at /Users/snak3/flutter
      • Framework revision 68587a0916 (3 months ago), 2019-09-13 19:46:58 -0700
      • Engine revision b863200c37
      • Dart version 2.5.0
  
  [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
      • Android SDK at /Users/snak3/Library/Android/sdk
      • Android NDK location not configured (optional; useful for native profiling support)
      • Platform android-29, build-tools 29.0.2
      • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
      • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
      • All Android licenses accepted.
  
  [✓] Xcode - develop for iOS and macOS (Xcode 11.0)
      • Xcode at /Applications/Xcode.app/Contents/Developer
      • Xcode 11.0, Build version 11A420a
      • CocoaPods version 1.8.4
  
  [✓] Android Studio (version 3.5)
      • Android Studio at /Applications/Android Studio.app/Contents
      • Flutter plugin version 41.1.2
      • Dart plugin version 191.8593
      • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b49-5587405)
  
  [✓] IntelliJ IDEA Ultimate Edition (version 2019.2)
      • IntelliJ at /Applications/IntelliJ IDEA.app
      • Flutter plugin version 39.0.4
      • Dart plugin version 192.7761
  
  [✓] VS Code (version 1.40.2)
      • VS Code at /Applications/Visual Studio Code.app/Contents
      • Flutter extension version 3.6.0
  
  [✓] Connected device (1 available)
      • iPhone 8 • EB666770-13C5-4CE6-B24A-657C875939A7 • ios •
        com.apple.CoreSimulator.SimRuntime.iOS-13-0 (simulator)
  
  • No issues found!
  </code></pre>
  
  <p><strong>EDIT</strong>:
  I have found a way to make it work momentarily. I open Xcode and I build it it there and the Simulator runs, i then close Xcode and have the Simulator and build my app with VSCode. But how would I fix the terminal command errors?</p>