Repository: flutter
Issue: Flutter Build iOS Fails - /tmp/Runner.dst/Applications/Runner.app does not exist
Labels: c: crash,platform-ios,tool,t: xcode,P3,team-ios,triaged-ios

## Command

flutter build iOS fails. I search the Internet but unable to find a solution.  I have attached a build fail.txt file located at 
https://github.com/churchevent/ChurchEvents/issues/1#issue-594615884

The last thing I did before building the project was 'Clean Build Folder' from Xcode, and 'Flutter Clean' from the command line.

## Logs

```
_Exception: Exception: Source directory "/tmp/Runner.dst/Applications/Runner.app" does not exist, nothing to copy

#0      FileSystemUtils.copyDirectorySync (package:flutter_tools/src/base/file_system.dart:61:7)
#1      buildXcodeProject (package:flutter_tools/src/ios/mac.dart:388:23)
<asynchronous suspension>
#2      BuildIOSCommand.runCommand (package:flutter_tools/src/commands/build_ios.dart:83:43)
#3      _rootRunUnary (dart:async/zone.dart:1192:38)
#4      _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#5      _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#7      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#8      Future._completeWithValue (dart:async/future_impl.dart:526:5)
#9      _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:36:15)
#10     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:306:13)
#11     ApplicationPackageStore.getPackageForPlatform (package:flutter_tools/src/application_package.dart)
#12     _rootRunUnary (dart:async/zone.dart:1192:38)
#13     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#14     _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#15     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#16     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#17     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#18     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:36:15)
```
```
[✓] Flutter (Channel master, v1.18.1-pre.10, on Mac OS X 10.15.3 19D76, locale en-US)
    • Flutter version 1.18.1-pre.10 at /Users/carlton/tools/flutter
    • Framework revision 6d52bf9884 (46 minutes ago), 2020-04-05 13:21:01 -0400
    • Engine revision 2cc6a6d66d
    • Dart version 2.8.0 (build 2.8.0-dev.20.0 80ae6ed91d)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/carlton/Library/Android/sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C505
    • CocoaPods version 1.9.1

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] VS Code (version 1.43.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.9.0

[✓] Connected device (2 available)
    • iPhone 11 Pro Max • DAD1B264-6F9C-4FAF-B7F0-122130454D04 • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-3
      (simulator)
    • iPhone 11         • 274CAF9A-91C7-4455-AA65-B69DB6177000 • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-0
      (simulator)

• No issues found!

```

## Flutter Application Metadata
```
**Type**: app
**Version**: 2.0.2+4
**Material**: true
**Android X**: false
**Module**: false
**Plugin**: false
**Android package**: null
**iOS bundle identifier**: null
**Creation channel**: stable
**Creation framework version**: 68587a0916366e9512a78df22c44163d041dd5f3
### Plugins
flutter_keyboard_visibility-0.7.0
flutter_local_notifications-1.2.2
flutter_plugin_android_lifecycle-1.0.5
geolocator-5.2.1
google_api_availability-2.0.2
google_maps_flutter-0.5.22+3
image_picker-0.6.3+1
location_permissions-2.0.4+1
path_provider-1.6.0
shared_preferences-0.5.6+1
shared_preferences_macos-0.0.1+4
shared_preferences_web-0.1.2+3
url_launcher-5.4.2
url_launcher_macos-0.0.1+4
url_launcher_web-0.1.1+1
webview_media-0.1.1+3

```