<p dir="auto">Right now it's "firebase_storage" instead of "plugins.flutter.io/firebase_storage"</p>
<p dir="auto">I think we should also rename <code class="notranslate">FirebaseStorage._channel</code> to <code class="notranslate">FirebaseStorage.channel</code> and mark it <code class="notranslate">@visibleForTesting</code> so it can only be used in tests, like we do for <a href="https://github.com/flutter/plugins/blob/master/packages/firebase_auth/lib/firebase_auth.dart#L89">firebase_auth</a>. Then we wouldn't need to duplicate the channel name in tests.</p>
<p dir="auto">I happened to have a file called <code class="notranslate">BUILD</code> in my directory.  I think we already had this reported but I didn't see one when searching.  FYI <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/danrubel/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/danrubel">@danrubel</a></p>
<p dir="auto">I doubt this will be a common error.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="flutter run    
Launching loader on iPhone SE...
Exception from flutter run: FileSystemException: Creation failed, path = 'build' (OS Error: File exists, errno = 17)
dart:io                                                           _Directory.createSync
package:file/src/sync/local/local_directory.dart 13               _LocalDirectory.create
package:flutter_tools/src/base/file_system.dart 65                ensureDirectoryExists
package:flutter_tools/src/flx.dart 149                            assemble.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 144                          AssetBundle.build.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 290                          _obtainLicenses.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _Completer.completeError
package:flutter_tools/src/flx.dart 158                            assemble.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 144                          AssetBundle.build.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 290                          _obtainLicenses.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/flx.dart                                assemble
package:flutter_tools/src/flx.dart 105                            build.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/flx.dart                                build
package:flutter_tools/src/ios/simulators.dart 526                 IOSSimulator._sideloadUpdatedAssetsForInstalledApplicationBundle.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator._sideloadUpdatedAssetsForInstalledApplicationBundle
package:flutter_tools/src/ios/simulators.dart 490                 IOSSimulator._setupUpdatedApplicationBundle.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator._setupUpdatedApplicationBundle
package:flutter_tools/src/ios/simulators.dart 419                 IOSSimulator.startApp.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator.startApp
package:flutter_tools/src/hot.dart 220                            HotRunner._run.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/resident_runner.dart 93                 ResidentRunner.startEchoingDeviceLog.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/hot.dart                                HotRunner._run
package:flutter_tools/src/hot.dart 147                            HotRunner.run.&lt;fn&gt;
dart:async                                                        runZoned
package:flutter_tools/src/hot.dart 146                            HotRunner.run
package:flutter_tools/src/commands/run.dart 194                   RunCommand.runCommand.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/commands/run.dart                       RunCommand.runCommand
package:flutter_tools/src/runner/flutter_command.dart 150         FlutterCommand.verifyThenRunCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/dart/pub.dart 62                        pubGet.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/runner/flutter_command.dart             FlutterCommand.verifyThenRunCommand
package:flutter_tools/src/commands/run.dart 122                   RunCommand.verifyThenRunCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/runner/flutter_command.dart 199         FlutterCommand.findTargetDevice.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/device.dart 70                          DeviceManager.getAllConnectedDevices.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/commands/run.dart                       RunCommand.verifyThenRunCommand
package:flutter_tools/src/runner/flutter_command.dart 117         FlutterCommand.run
package:args/command_runner.dart 177                              CommandRunner.runCommand.&lt;fn&gt;
dart:async                                                        Future.Future.sync
package:args/command_runner.dart 130                              CommandRunner.runCommand
package:flutter_tools/src/runner/flutter_command_runner.dart 186  FlutterCommandRunner.runCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/cache.dart 71                           Cache.lock.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/runner/flutter_command_runner.dart      FlutterCommandRunner.runCommand
package:args/command_runner.dart 104                              CommandRunner.run.&lt;fn&gt;
dart:async                                                        Future.Future.sync
package:args/command_runner.dart 104                              CommandRunner.run
package:flutter_tools/src/runner/flutter_command_runner.dart 132  FlutterCommandRunner.run
package:flutter_tools/executable.dart 97                          main.&lt;async&gt;.&lt;fn&gt;.&lt;async&gt;
===== asynchronous gap ===========================
package:stack_trace                                               Chain.capture
package:flutter_tools/executable.dart 91                          main.&lt;async&gt;

AppleIDAuthAgent[66101]: objc: Class PLBuildVersion is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x10e7b1910) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x10bf3f210). One of the two will be used. Which one is undefined.
locationd: Location icon should now be in state 'Inactive'"><pre class="notranslate"><code class="notranslate">flutter run    
Launching loader on iPhone SE...
Exception from flutter run: FileSystemException: Creation failed, path = 'build' (OS Error: File exists, errno = 17)
dart:io                                                           _Directory.createSync
package:file/src/sync/local/local_directory.dart 13               _LocalDirectory.create
package:flutter_tools/src/base/file_system.dart 65                ensureDirectoryExists
package:flutter_tools/src/flx.dart 149                            assemble.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 144                          AssetBundle.build.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 290                          _obtainLicenses.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _Completer.completeError
package:flutter_tools/src/flx.dart 158                            assemble.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 144                          AssetBundle.build.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/asset.dart 290                          _obtainLicenses.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/flx.dart                                assemble
package:flutter_tools/src/flx.dart 105                            build.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/flx.dart                                build
package:flutter_tools/src/ios/simulators.dart 526                 IOSSimulator._sideloadUpdatedAssetsForInstalledApplicationBundle.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator._sideloadUpdatedAssetsForInstalledApplicationBundle
package:flutter_tools/src/ios/simulators.dart 490                 IOSSimulator._setupUpdatedApplicationBundle.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator._setupUpdatedApplicationBundle
package:flutter_tools/src/ios/simulators.dart 419                 IOSSimulator.startApp.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/ios/simulators.dart                     IOSSimulator.startApp
package:flutter_tools/src/hot.dart 220                            HotRunner._run.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/resident_runner.dart 93                 ResidentRunner.startEchoingDeviceLog.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/hot.dart                                HotRunner._run
package:flutter_tools/src/hot.dart 147                            HotRunner.run.&lt;fn&gt;
dart:async                                                        runZoned
package:flutter_tools/src/hot.dart 146                            HotRunner.run
package:flutter_tools/src/commands/run.dart 194                   RunCommand.runCommand.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        Future.Future.microtask
package:flutter_tools/src/commands/run.dart                       RunCommand.runCommand
package:flutter_tools/src/runner/flutter_command.dart 150         FlutterCommand.verifyThenRunCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/dart/pub.dart 62                        pubGet.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/runner/flutter_command.dart             FlutterCommand.verifyThenRunCommand
package:flutter_tools/src/commands/run.dart 122                   RunCommand.verifyThenRunCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/runner/flutter_command.dart 199         FlutterCommand.findTargetDevice.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/device.dart 70                          DeviceManager.getAllConnectedDevices.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/commands/run.dart                       RunCommand.verifyThenRunCommand
package:flutter_tools/src/runner/flutter_command.dart 117         FlutterCommand.run
package:args/command_runner.dart 177                              CommandRunner.runCommand.&lt;fn&gt;
dart:async                                                        Future.Future.sync
package:args/command_runner.dart 130                              CommandRunner.runCommand
package:flutter_tools/src/runner/flutter_command_runner.dart 186  FlutterCommandRunner.runCommand.&lt;async&gt;
dart:async                                                        _SyncCompleter.complete
package:flutter_tools/src/cache.dart 71                           Cache.lock.&lt;async&gt;
===== asynchronous gap ===========================
dart:async                                                        _asyncThenWrapperHelper
package:flutter_tools/src/runner/flutter_command_runner.dart      FlutterCommandRunner.runCommand
package:args/command_runner.dart 104                              CommandRunner.run.&lt;fn&gt;
dart:async                                                        Future.Future.sync
package:args/command_runner.dart 104                              CommandRunner.run
package:flutter_tools/src/runner/flutter_command_runner.dart 132  FlutterCommandRunner.run
package:flutter_tools/executable.dart 97                          main.&lt;async&gt;.&lt;fn&gt;.&lt;async&gt;
===== asynchronous gap ===========================
package:stack_trace                                               Chain.capture
package:flutter_tools/executable.dart 91                          main.&lt;async&gt;

AppleIDAuthAgent[66101]: objc: Class PLBuildVersion is implemented in both /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices (0x10e7b1910) and /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/PrivateFrameworks/PhotoLibraryServices.framework/PhotoLibraryServices (0x10bf3f210). One of the two will be used. Which one is undefined.
locationd: Location icon should now be in state 'Inactive'
</code></pre></div>