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flutter build ios - Crash - [tool_crash] FormatException : Missing extension byte (at offset 17) #81666

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flutter build ios - Crash - [tool_crash] FormatException : Missing extension byte (at offset 17)#81666
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P2Important issues not at the top of the work lista: buildBuilding flutter applications with the toolc: crashStack traces logged to the consoleplatform-iosiOS applications specificallyteam-iosOwned by iOS platform teamtoolAffects the "flutter" command-line tool. See also t: labels.triaged-iosTriaged by iOS platform team

Description

@eminovperviz
eminovperviz
opened on May 3, 2021

Command

flutter build ios

Steps to Reproduce

  1. ...
  2. ...
  3. ...

Logs

FormatException

#0      _Utf8Decoder.convertChunked (dart:convert-patch/convert_patch.dart:1892:7)
#1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:314:28)
#2      _Utf8ConversionSink.add (dart:convert/string_conversion.dart:310:5)
#3      _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:72:18)
#4      _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:111:24)
#5      _rootRunUnary (dart:async/zone.dart:1436:47)
#6      _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#10     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:733:19)
#11     _StreamController._add (dart:async/stream_controller.dart:607:7)
#12     _StreamController.add (dart:async/stream_controller.dart:554:5)
#13     _Socket._onData (dart:io-patch/socket_patch.dart:2160:41)
#14     _rootRunUnary (dart:async/zone.dart:1444:13)
#15     _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#19     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:733:19)
#20     _StreamController._add (dart:async/stream_controller.dart:607:7)
#21     _StreamController.add (dart:async/stream_controller.dart:554:5)
#22     new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1696:33)
#23     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1208:14)
#24     _microtaskLoop (dart:async/schedule_microtask.dart:40:21)

[✓] Flutter (Channel master, 2.3.0-1.0.pre.205, on macOS 11.1 20C69 darwin-x64, locale en)
    • Flutter version 2.3.0-1.0.pre.205 at /Users/bestcomp/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 96e4b47f5d (17 hours ago), 2021-05-02 07:24:01 -0700
    • Engine revision 3e578c6e0d
    • Dart version 2.14.0 (build 2.14.0-48.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/bestcomp/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.40.2)
    • VS Code at /Users/bestcomp/Downloads/Visual Studio Code.app/Contents
    • Flutter extension version 3.8.1

[✓] Connected device (1 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 90.0.4430.93

• No issues found!

Flutter Application Metadata

Type: app
Version: 4.0.1+11
Material: true
Android X: false
Module: false
Plugin: false
Android package: null
iOS bundle identifier: null
Creation channel: stable
Creation framework version: 8874f21

Plugins

connectivity-2.0.2
connectivity_for_web-0.3.1+4
connectivity_macos-0.1.0+7
file_picker-2.1.7
flutter_full_pdf_viewer-1.0.6
flutter_plugin_android_lifecycle-1.0.11
flutter_secure_storage-3.3.5
image_picker-0.6.7+22
import_js_library-1.0.2
libphonenumber-1.0.2
onesignal_flutter-2.6.3
open_file-3.1.0
path_provider-1.6.28
path_provider_linux-0.0.1+2
path_provider_macos-0.0.4+8
path_provider_windows-0.0.5
permission_handler-5.1.0+2
shared_preferences-0.5.12+4
shared_preferences_linux-0.0.2+4
shared_preferences_macos-0.0.1+11
shared_preferences_web-0.1.2+7
shared_preferences_windows-0.0.2+3
sqflite-2.0.0+3
url_launcher-5.7.10
url_launcher_linux-0.0.1+4
url_launcher_macos-0.0.1+9
url_launcher_web-0.1.5+3
url_launcher_windows-0.0.1+3
video_player-1.0.1
video_player_web-0.1.4+1
wakelock-0.2.1+1
wakelock_web-0.1.0+3
webview_cookie_manager-1.0.8
webview_flutter-1.0.7

Activity

  1. pedromassangocode
    added
    in triagePresently being triaged by the triage team
    a: buildBuilding flutter applications with the tool
    passed first triage
    platform-iosiOS applications specifically
    c: crashStack traces logged to the console
    toolAffects the "flutter" command-line tool. See also t: labels.
    and removed
    in triagePresently being triaged by the triage team
    on May 3, 2021

  2. eminovperviz commented on May 3, 2021

    @eminovperviz
    eminovperviz
    on May 3, 2021
    Author

    I solved problem by following steps.

    1. Downgrade Flutter version to Stable v2.0.6
    2. Delete ./pub-cache folder
    3. Repair pub cache - packages
    4. Then build ios

  3. pedromassangocode commented on May 3, 2021

    @pedromassangocode
    pedromassangocode
    on May 3, 2021

    Now that this is solved, I'm not sure if this should be closed.
    Cc @jmagman

  4. jmagman commented on May 4, 2021

    @jmagman
    jmagman
    on May 4, 2021
    Member

    I'm not sure which package would cause this, let's leave it open.
    See also #65932

  5. jerryzhoujw commented on Jul 30, 2021

    @jerryzhoujw
    jerryzhoujw
    on Jul 30, 2021
    Contributor

    After i upgrade to nullable safety with the project.
    I build the project.with flutter build ios --release
    I got error: FormatException: FormatException: Missing extension byte (at offset 29)

    How to find which part causing this error ?

    [+3887 ms] FormatException: Missing extension byte (at offset 29)
[   +6 ms] "flutter run" took 210,569ms.
[   +8 ms]
           #0      throwToolExit (package:flutter_tools/src/base/common.dart:10:3)
           #1      RunCommand.runCommand (package:flutter_tools/src/commands/run.dart:663:9)
           <asynchronous suspension>
           #2      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1043:27)
           <asynchronous suspension>
           #3      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
           <asynchronous suspension>
           #4      CommandRunner.runCommand (package:args/command_runner.dart:196:13)
           <asynchronous suspension>
           #5      FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:284:9)
           <asynchronous suspension>
           #6      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
           <asynchronous suspension>
           #7      FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:232:5)
           <asynchronous suspension>
           #8      run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:62:9)
           <asynchronous suspension>
           #9      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:19)
           <asynchronous suspension>
           #10     main (package:flutter_tools/executable.dart:91:3)
           <asynchronous suspension>


[ +257 ms] ensureAnalyticsSent: 256ms
[   +3 ms] Running shutdown hooks
[        ] Shutdown hooks complete
[        ] exiting with code 1
    Flutter crash report

    command

    flutter build ios --release

    exception

    FormatException: FormatException: Missing extension byte (at offset 29)

    #0      _Utf8Decoder.convertChunked (dart:convert-patch/convert_patch.dart:1891:7)
#1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:314:28)
#2      _Utf8ConversionSink.add (dart:convert/string_conversion.dart:310:5)
#3      _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:72:18)
#4      _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:111:24)
#5      _rootRunUnary (dart:async/zone.dart:1362:47)
#6      _CustomZone.runUnary (dart:async/zone.dart:1265:19)
#7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1170:7)
#8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#10     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:733:19)
#11     _StreamController._add (dart:async/stream_controller.dart:607:7)
#12     _StreamController.add (dart:async/stream_controller.dart:554:5)
#13     _Socket._onData (dart:io-patch/socket_patch.dart:2160:41)
#14     _rootRunUnary (dart:async/zone.dart:1370:13)
#15     _CustomZone.runUnary (dart:async/zone.dart:1265:19)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1170:7)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#19     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:733:19)
#20     _StreamController._add (dart:async/stream_controller.dart:607:7)
#21     _StreamController.add (dart:async/stream_controller.dart:554:5)
#22     new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1696:33)
#23     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1208:14)
#24     _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#25     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)
#26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:120:13)
#27     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:185:5)

    flutter doctor

    [✓] Flutter (Channel stable, 2.2.3, on macOS 11.5 20G71 darwin-x64, locale en-CN)
    • Flutter version 2.2.3 at /Users/jerryzhou/Documents/code/flutter/sdk/flutter
    • Framework revision f4abaa0735 (4 weeks ago), 2021-07-01 12:46:11 -0700
    • Engine revision 241c87ad80
    • Dart version 2.13.4
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc1)
    • Android SDK at /Users/jerryzhou/Library/Android/sdk
    • Platform android-30, build-tools 30.0.0-rc1
    • Java binary at: /Users/jerryzhou/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/192.6392135/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 at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 3.6)
    • Android Studio at /Users/jerryzhou/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/192.6392135/Android Studio.app/Contents
    • Flutter plugin version 45.1.1
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✗] Cannot determine if IntelliJ is installed
    ✗ Directory listing failed

[✓] VS Code (version 1.58.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.24.0

[✓] Connected device (1 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 92.0.4515.107

! Doctor found issues in 1 category.

  6. jmagman commented on Jul 30, 2021

    @jmagman
    jmagman
    on Jul 30, 2021
    Member

    This is the number 4 crasher on the latest beta, though the absolute number is low. It also shows up from flutter devices.

    @jonahwilliams any idea where this is coming from, or how to improve the stacktrace?

  7. jonahwilliams commented on Jul 30, 2021

    @jonahwilliams
    jonahwilliams
    on Jul 30, 2021
    Contributor

    The general problem is dart-lang/sdk#44994 . There are unfortunately multiple layers where reasonable stacks are dropped.

  8. jerryzhoujw commented on Aug 20, 2021

    @jerryzhoujw
    jerryzhoujw
    on Aug 20, 2021
    Contributor

    Actually every time after flutter clean, it's only show error on first build, and if I run flutter build ios --release again, error gone.

  9. pliniocelos commented on Sep 8, 2021

    @pliniocelos
    pliniocelos
    on Sep 8, 2021

    I've been trying all stuff I found googling, but nothing works.

  10. 8 remaining items

  11. zy1041081552 commented on Dec 28, 2021

    @zy1041081552
    zy1041081552
    on Dec 28, 2021

    Who can solve this problem, this problem has been bothering me for 2 weeks.

    I solved this problem, #95881 and If your flutter project has a resource file with a non-English name, then you need to add this parameter in the "rsync App.framework" place

    Thank you so much ! ! ! I changed the Chinese in the resource name to English, which solved my problem !

  12. flutter-triage-bot
    added
    multiteam-retriage-candidate
    team-iosOwned by iOS platform team
    triaged-iosTriaged by iOS platform team
    on Jul 8, 2023
  13. Hixie
    removed
    passed first triage
    on Jul 8, 2023
  14. stuartmorgan-g
    added
    P2Important issues not at the top of the work list
    on Aug 14, 2023
  15. Hixie
    removed
    multiteam-retriage-candidate
    on Mar 6, 2024
  16. tirth-patel-nc
    marked flutter doctor missing extension byte at offset 72 #174703 as a duplicate of this issue on Sep 3, 2025
  17. bkonyi
    added a commit that references this issue on Oct 23, 2025

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    466b80c
  18. github-merge-queue
    added a commit that references this issue on Oct 27, 2025

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    860e807
  19. flutter-zl
    added a commit that references this issue on Oct 31, 2025

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    fa98f38
  20. flutteractionsbot
    added a commit that references this issue on Nov 4, 2025

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    74cc83c
  21. auto-submit
    added a commit that references this issue on Nov 11, 2025

    [CP-beta][ Tool ] Add `Stream.transformWithCallSite` to provide more …

    5205556
  22. reidbaker
    added a commit that references this issue on Dec 10, 2025

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    815ed47
  23. Nakiha
    added a commit that references this issue on Sep 28, 2026

    [ Tool ] Add `Stream.transformWithCallSite` to provide more useful st…

    6924fc4
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    P2Important issues not at the top of the work lista: buildBuilding flutter applications with the toolc: crashStack traces logged to the consoleplatform-iosiOS applications specificallyteam-iosOwned by iOS platform teamtoolAffects the "flutter" command-line tool. See also t: labels.triaged-iosTriaged by iOS platform team

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