Bad state: Unable to start build daemon

[Troverun]

webdev serve command

[WARNING] Deleted previous snapshot due to missing asset graph.
[INFO] Unhandled exception:erver/src/utils.dart               supportsIPv6.<fn>[2Kn[2K[2KKt, port = 0[2K
Bad state: Unable to start build daemon.
#0      _handleDaemonStartup (package:build_daemon/client.dart:52:5)
<asynchronous suspension>
dart-lang/tools#1681      BuildDaemonClient.connect (package:build_daemon/client.dart:142:11)
<asynchronous suspension>
dart-lang/tools#1682      connectClient (package:webdev/src/daemon_client.dart:17:23)
dart-lang/tools#1683      _startBuildDaemon (package:webdev/src/serve/dev_workflow.dart:24:18)
<asynchronous suspension>
dart-lang/tools#1684      DevWorkflow.start (package:webdev/src/serve/dev_workflow.dart:165:24)
<asynchronous suspension>
dart-lang/tools#1685      ServeCommand.run (package:webdev/src/command/serve_command.dart:110:27)
<asynchronous suspension>
dart-lang/tools#1686      CommandRunner.runCommand (package:args/command_runner.dart:196:27)
<asynchronous suspension>
dart-lang/tools#1687      _CommandRunner.runCommand (package:webdev/src/webdev_command_runner.dart:38:24)
<asynchronous suspension>
dart-lang/tools#1688      CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:111:29)
dart-lang/tools#1689      new Future.sync (dart:async/future.dart:224:31)
dart-lang/tools#1690     CommandRunner.run (package:args/command_runner.dart:111:11)
dart-lang/tools#1691     run (package:webdev/src/webdev_command_runner.dart:19:56)
dart-lang/tools#1692     main (file:///C:/Users/Administrator/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/webdev-2.0.4/bin/webdev.dart:17:22)
<asynchronous suspension>
dart-lang/tools#1693     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:298:32)
dart-lang/tools#1694     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:171:12)
[WARNING] Deleted previous snapshot due to missing asset graph.

How to do?

[grouma]

What version of webdev are you using? (run webdev --version)

What version of build_runner and build_daemon are you using in your application? (Can be found in pubspec.lock)

You should be able to run the command pub run build_runner daemon in your application workspace. If that doesn't work please provide the error message.

@grouma

2.0.4

  build_daemon:
    dependency: transitive
    description:
      name: build_daemon
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.6.0"

  build_runner:
    dependency: "direct dev"
    description:
      name: build_runner
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.0"

  build_runner_core:
    dependency: transitive
    description:
      name: build_runner_core
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.5"

pub run build_runner daemon

SocketException: Failed to create server socket (OS Error: Can't assign requested address, errno = 49), address = localhost, port = 0
dart:_http                                             HttpServer.bind
package:shelf/shelf_io.dart 45:20                      serve
package:build_daemon/src/server.dart 82:21             Server.listen
package:build_daemon/src/daemon.dart 71:30             Daemon.start
dart:async                                             _AsyncAwaitCompleter.start
package:build_daemon/src/daemon.dart 58:21             Daemon.start
package:build_runner/src/entrypoint/daemon.dart 74:20  DaemonCommand.run
dart:async                                             _completeOnAsyncReturn
package:build_runner/src/daemon/asset_server.dart      AssetServer.run
dart:async                                             _completeOnAsyncReturn
package:http_multi_server/http_multi_server.dart       HttpMultiServer._loopback

port 0 ? ^^

[grouma]

Thanks for the error message. That will definitely help figure out what's going on.

As for the 0 port, it's intentional:
https://github.com/dart-lang/build/blob/master/build_daemon/lib/src/server.dart#L82

I do not believe it is documented but I thought the 0 port indicates that any open port should be used.

What operating system are you using?

@grouma
macOS Mojave

[grouma]

Looks like it is a local error. A restart or this can solve it:
http://codefromabove.com/quickies/osx-cant-assign-requested-address-code49/

[grouma]

Closing this one.

We should provide a better error message though:
dart-lang/build#2259

reboot / ifconfig did not fix things
but i removed some entries in /etc/hosts and it fixed things

[grouma]

Glad you got it working. Enjoy the Flutter Web preview!

yup i was waiting web for months

[Goolpe]

@grouma
I have the same error on Windows 7 (x64). Restart didn't help

SocketException: Failed to create server socket (OS Error: Failed to start accept), address = localhost, port = 0
dart:_http                                             HttpServer.bind
serve
package:shelf/shelf_io.dart:45
Server.listen
package:build_daemon/src/server.dart:82
Daemon.start
package:build_daemon/src/daemon.dart:71
dart:async                                             _AsyncAwaitCompleter.start
Daemon.start
package:build_daemon/src/daemon.dart:58
DaemonCommand.run
package:build_runner/…/entrypoint/daemon.dart:74
dart:async                                             _completeOnAsyncReturn
package:build_runner/src/daemon/asset_server.dart      AssetServer.run
dart:async                                             _completeOnAsyncReturn
package:http_multi_server/http_multi_server.dart       HttpMultiServer._loopback
dart:async                                             _completeOnAsyncReturn
package:http_multi_server/src/utils.dart               supportsIPv6.<fn>
Unhandled exception:
Bad state: Unable to start build daemon.
#0      _handleDaemonStartup
package:build_daemon/client.dart:52
<asynchronous suspension>
dart-lang/tools#1681      BuildDaemonClient.connect
package:build_daemon/client.dart:142
<asynchronous suspension>
dart-lang/tools#1682      connectClient  (package:webdev/src/daemon_client.dart:17:23)
dart-lang/tools#1683      _startBuildDaemon  (package:webdev/src/serve/dev_workflow.dart:24:18)
<asynchronous suspension>
dart-lang/tools#1684      DevWorkflow.start  (package:webdev/src/serve/dev_workflow.dart:165:24)
<asynchronous suspension>
dart-lang/tools#1685      DaemonCommand.run  (package:webdev/src/command/daemon_command.dart:77:36)
<asynchronous suspension>
dart-lang/tools#1686      CommandRunner.runCommand
package:args/command_runner.dart:196
<asynchronous suspension>
dart-lang/tools#1687      _CommandRunner.runCommand  (package:webdev/src/webdev_command_runner.dart:38:24)
<asynchronous suspension>
dart-lang/tools#1688      CommandRunner.run.<anonymous closure>
package:args/command_runner.dart:111
dart-lang/tools#1689      new Future.sync  (dart:async/future.dart:224:31)
dart-lang/tools#1690     CommandRunner.run
package:args/command_runner.dart:111
dart-lang/tools#1691     run  (package:webdev/src/webdev_command_runner.dart:19:56)
dart-lang/tools#1692     main
..\…\bin\webdev.dart:17
<asynchronous suspension>
dart-lang/tools#1693     _startIsolate.<anonymous closure>  (dart:isolate-patch/isolate_patch.dart:298:32)
dart-lang/tools#1694     _RawReceivePortImpl._handleMessage  (dart:isolate-patch/isolate_patch.dart:171:12)

[√] Flutter (Channel dev, v1.5.8, on Microsoft Windows [Version 6.1.7601], locale ru-RU)
    • Flutter version 1.5.8 at C:\flutter
    • Framework revision 0ba67226ee (2 weeks ago), 2019-04-24 17:18:28 -0700
    • Engine revision c63d1cf9c9
    • Dart version 2.3.0 (build 2.3.0-dev.0.1 1f1592edce)

[√] VS Code (version 1.33.1)
    • VS Code at C:\Users\Freedlee\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.0.1
 
  webdev: 2.0.4
  build_runner: ^1.4.0
  build_web_compilers: ^2.0.0