Flutter compiler suddenly stopped working

[brighttank]

Target dart2js failed: ProcessException: Process exited abnormally with exit code 253:
.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/main.dart:
Internal Error: The compiler crashed when compiling this element.

The compiler is broken.

When compiling the above element, the compiler crashed. It is not
possible to tell if this is caused by a problem in your program or
not. Regardless, the compiler should not crash.

The Dart team would greatly appreciate if you would take a moment to
report this problem at http://dartbug.com/new.

Please include the following information:

• the name and version of your operating system,

• the Dart SDK build number (3.7.2), and

• the entire message you see here (including the full stack trace
  below as well as the source location above).

The compiler crashed: Crash when compiling
file:///Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/main.dart:
Unexpected Kernel SDK Version f6ed8d7 (expected 9594995).

#0 BinaryBuilder._readAndVerifySdkHash (package:kernel/binary/ast_from_binary.dart:657)
#1 BinaryBuilder._verifyComponentInitialBytes (package:kernel/binary/ast_from_binary.dart:874)
#2 BinaryBuilder.readComponent. (package:kernel/binary/ast_from_binary.dart:697)
#3 Timeline.timeSync (dart:developer/timeline.dart:188)
#4 BinaryBuilder.readComponent (package:kernel/binary/ast_from_binary.dart:695)
#5 ProcessedOptions.loadComponent (package:front_end/src/base/processed_options.dart:590)
#6 ProcessedOptions.loadAdditionalDills (package:front_end/src/base/processed_options.dart:572)

#7 generateKernelInternal. (package:front_end/src/kernel_generator_impl.dart:114)

#8 withCrashReporting (package:front_end/src/base/crash.dart:139)

#9 compile. (package:front_end/src/api_unstable/dart2js.dart:166)

#10 CompilerContext.clear (package:front_end/src/base/compiler_context.dart:77)

#11 compile (package:front_end/src/api_unstable/dart2js.dart:164)

#12 _loadFromSource (package:compiler/src/phase/load_kernel.dart:372)

#13 run (package:compiler/src/phase/load_kernel.dart:486)

#14 Compiler.loadKernel (package:compiler/src/compiler.dart:428)

#15 Compiler.produceKernel (package:compiler/src/compiler.dart:437)

#16 Compiler.runSequentialPhases (package:compiler/src/compiler.dart:722)

#17 Compiler.runInternal. (package:compiler/src/compiler.dart:339)

#18 Compiler.runInternal (package:compiler/src/compiler.dart:338)

#19 Compiler.run. (package:compiler/src/compiler.dart:250)

#20 compile. (package:compiler/compiler_api.dart:273)

#21 compile.compilationDone (package:compiler/src/dart2js.dart:777)

#22 main (package:compiler/src/dart2js.dart:1327)

Command: /Users/andrew/fvm/versions/3.29.2/bin/cache/dart-sdk/bin/dart compile js
--platform-binaries=/Users/andrew/fvm/versions/3.29.2/bin/cache/flutter_web_sdk/kernel --invoker=flutter_tool -Ddart.vm.product=true
-DFLUTTER_WEB_USE_SKIA=true -DFLUTTER_WEB_USE_SKWASM=false
-DFLUTTER_WEB_CANVASKIT_URL=https://www.gstatic.com/flutter-canvaskit/18b71d647a292a980abb405ac7d16fe1f0b20434/ --native-null-assertions
--no-source-maps -o /Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/app.dill
--packages=/Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/package_config.json --cfe-only
/Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/main.dart
#0 RunResult.throwException (package:flutter_tools/src/base/process.dart:118:5)
#1 _DefaultProcessUtils.run (package:flutter_tools/src/base/process.dart:344:19)

#2 Dart2JSTarget.build (package:flutter_tools/src/build_system/targets/web.dart:201:5)

#3 _BuildInstance._invokeInternal (package:flutter_tools/src/build_system/build_system.dart:876:9)

#4 Future.wait. (dart:async/future.dart:528:21)

#5 _BuildInstance.invokeTarget (package:flutter_tools/src/build_system/build_system.dart:814:32)

#6 Future.wait. (dart:async/future.dart:528:21)

#7 _BuildInstance.invokeTarget (package:flutter_tools/src/build_system/build_system.dart:814:32)

#8 FlutterBuildSystem.build (package:flutter_tools/src/build_system/build_system.dart:637:16)

#9 WebBuilder.buildWeb (package:flutter_tools/src/web/compile.dart:93:34)

#10 BuildWebCommand.runCommand (package:flutter_tools/src/commands/build_web.dart:253:5)

#11 FlutterCommand.run. (package:flutter_tools/src/runner/flutter_command.dart:1558:27)

#12 AppContext.run. (package:flutter_tools/src/base/context.dart:154:19)

#13 CommandRunner.runCommand (package:args/command_runner.dart:212:13)

#14 FlutterCommandRunner.runCommand. (package:flutter_tools/src/runner/flutter_command_runner.dart:496:9)

#15 AppContext.run. (package:flutter_tools/src/base/context.dart:154:19)

#16 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:431:5)

#17 run.. (package:flutter_tools/runner.dart:98:11)

#18 AppContext.run. (package:flutter_tools/src/base/context.dart:154:19)

#19 main (package:flutter_tools/executable.dart:99:3)

Compiling lib/main.dart for the Web... 441ms
Error: Failed to compile application for the Web

[brighttank]

If I downgrade to flutter 3.29.0 or 3.29.1 then the problem disappears. Upgrading causes it to re-appear. I've run flutter clean but it doesn't help.

[ManuelRauber]

Same issue here.

After reinstalling Flutter (via fvm), flutter clean etc. it works one time. The second compile the same error rises up.

Flutter doctor:

[✓] Flutter (Channel stable, 3.29.2, on macOS 15.3.2 24D81 darwin-arm64, locale en-GB) [435ms]
    • Flutter version 3.29.2 on channel stable at /Users/manuelrauber/fvm/versions/3.29.2
    • Upstream repository ssh://git@github.com/flutter/flutter.git
    • Framework revision c236373904 (13 days ago), 2025-03-13 16:17:06 -0400
    • Engine revision 18b71d647a
    • Dart version 3.7.2
    • DevTools version 2.42.3

Never had issues with Flutter installed via fvm so far.

[johnniwinther]

@jensjoha Do you know how this can happen? (Also why don't we report an error instead of crashing?)

[brighttank]

For reference, here's my flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.29.2, on macOS 14.7 23H124 darwin-arm64, locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/to/macos-android-setup for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.2)
[✓] IntelliJ IDEA Ultimate Edition (version 2024.3.1.1)
[✓] IntelliJ IDEA Community Edition (version 2024.2.3)
[✓] VS Code (version 1.96.4)
[✓] Connected device (4 available)
[✓] Network resources

! Doctor found issues in 1 category.

I've also tried deleting my local pub-cache but that didn't help either.

[jensjoha]

From the the command:

Command: /Users/andrew/fvm/versions/3.29.2/bin/cache/dart-sdk/bin/dart compile js
--platform-binaries=/Users/andrew/fvm/versions/3.29.2/bin/cache/flutter_web_sdk/kernel --invoker=flutter_tool -Ddart.vm.product=true
-DFLUTTER_WEB_USE_SKIA=true -DFLUTTER_WEB_USE_SKWASM=false
-DFLUTTER_WEB_CANVASKIT_URL=https://www.gstatic.com/flutter-canvaskit/18b71d647a292a980abb405ac7d16fe1f0b20434/ --native-null-assertions
--no-source-maps -o /Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/app.dill
--packages=/Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/package_config.json --cfe-only
/Users/andrew/Intellij/rememberit/client/modules/rememberit_web/.dart_tool/flutter_build/2b895b047c2de07e6cc46404a9075afa/main.dart

Specifically this part:

--platform-binaries=/Users/andrew/fvm/versions/3.29.2/bin/cache/flutter_web_sdk/kernel

and the way it's crashing I'm guessing there's been some thing wrong with the files in this folder.
Could you try to delete /Users/andrew/fvm/versions/3.29.2/bin/cache/?
That should make flutter re-download things --- unless "fvm" (which I don't know) makes it to other things.

[brighttank]

Thanks, that fixed things.