Debugger stuck on waiting for connection from debug service on chrome when trying to run on web using Flutter 2.x

Describe the bug
Debugger stuck on waiting for connection from debug service on chrome when trying to run on web

To Reproduce
Steps to reproduce the behavior:

having a flutter project with an older version 2.10.5 for example
click on debug

Expected behavior
project was supposed to run normally

Screenshots

Please complete the following information:

Operating System and version: Ubuntu 22.04.1 LTS
VS Code version: 1.74.3
Dart extension version: 3.58.0
Dart/Flutter SDK version: 2.16.2/2.10.5
Target device (if the issue relates to Flutter debugging): chrome

@felipefranca824

@felipefranca824 from the error in your screenshot, it looks like there is a problem with the code (trying to use ?? after a non-nullable variable).

Does fixing that issue resolved the problem?

If not, can you produce a small sample project that triggers this issue that you can share? Thanks!

@DanTup

@DanTup
Reproduced in a new project

doesn't come out of it.

but if i run by command line "fllutter run -d chome" it works

@felipefranca824

@felipefranca824 can you reproduce this reliably?

Did you make any changes to the sample project, or run it as is (and how did you start it?).

Could you try capturing debugging logs while reproducing it (using the sample project)?

Run the Dart: Capture Debugging Logs command
Run the project to reproduce the issue
Wait at least 30s after Chrome appears, just to ensure the log isn't cut short of anything that might be running slowly
Click Cancel on the logging notification to stop logging and open the log
Remove anything sensitive from the log
Attach the log here, in a gist, or email to me at [email protected].

Thanks!

@DanTup

@DanTup
I ran the project without any modifications.

I sent the log file to your email

@felipefranca824

@felipefranca824 thanks! I found the issue in your log:

setIsolatePauseMode: NoSuchMethodError: Class 'ChromeProxyService' has no instance method 'setIsolatePauseMode' with matching arguments.
Receiver: Instance of 'ChromeProxyService'
Tried calling: setIsolatePauseMode(\"1\", exceptionPauseMode: \"Unhandled\", shouldPauseOnExit: null)
Found: setIsolatePauseMode(String, {String exceptionPauseMode, bool shouldPauseOnExit}) => Future<Success>

This was a bug in earlier versions of Flutter (dart-lang/webdev#1627). It's since been fixed but you'll need to upgrade Flutter to a more recent version to get the fix (the current version is 3.7).

The reason it works from the command line is that this doesn't set up the debugger, which avoids the code that is failing.

Please let me know if you still have the issue after upgrading!

After updating the problem was solved.

to continue using in older versions of flutter I used version 3.56.0 of the dartcode extension.

thanks

to continue using in older versions of flutter I used version 3.56.0 of the dartcode extension.

Oh, I see what's happened here. The new version of the extension is using a new version of the API, but there's a mismatch between the VM Service version that supports this in DWDS (web) versus the standard VM.

This is unfortunate, although since the latest stable versions of everything are working (and using the previous extension works around the issue) I think it's probably not worth trying to find a way to handle this for now. If it turns out the issue is widespread, we can re-visit this.

Thanks!

I'm getting this issue revisiting a flutter web project there hasn't been touched for 7 months - so very likely one of the latest dart extension upgrades is the culprit - its very annoying and i do not really wanna do a 2.x 3.x upgrade as we're close to go-live for a large client

@psimondk

@psimondk the quickest fix would be rolling back the Dart extension to v3.56:

I'll have a look to see whether there's a version we can gate on that avoids this issue for both web/non-web.

I've updated the version for when the extension start using the new API to something I believe works for both cases. If you switch to the Pre-release channel for the extension, you'll get this fix now without needing to use an older version of the extension:

You can switch back to the stable versions of the extension after the next release (or, stick with this - it should generally be stable anyway, as it's usually only published to make fixes like this available to people a little sooner).

And I can confirm that it works like a charm - thanks a lot for stepping up to help on this - we had a very good demo for a German Client last friday and now we can debug our accompanying dashboard too! [image: image.png] Best Regards, Palle S.

…

On Mon, Feb 13, 2023 at 2:22 PM Danny Tuppeny ***@***.***> wrote: I've updated the version for when the extension start using the new API to something I believe works for both cases. If you switch to the Pre-release channel for the extension, you'll get this fix now without needing to use an older version of the extension: [image: Screenshot 2023-02-13 at 12 19 54] <https://user-images.githubusercontent.com/1078012/218456057-b695fd12-3db0-471e-acd8-4c267993680b.png> You can switch back to the stable versions of the extension after the next release (or, stick with this - it should generally be stable anyway, as it's usually only published to make fixes like this available to people a little sooner). — Reply to this email directly, view it on GitHub <#4370 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAP6EPLFFGWTDHPABPNNFRDWXIROVANCNFSM6AAAAAAUMMWKPI> . You are receiving this because you were mentioned.Message ID: ***@***.***>

Hello,

I encountered the issue too on a Flutter 2.10.5 project.
Using the Dart extension pre-release version solved it.

Thanks

Hello,

If it can help someone...

I had the same issue on a Flutter 2.10 project using Android Studio and Flutter plugin (version 73).
As suggested by previous comments, I have installed previous release of Flutter plugin (version 72) manually and it is now working fine.

Here are the steps :

I have downloaded the zip plugin file here (be careful to select "compatibility" to "Android Studio"):
https://plugins.jetbrains.com/plugin/9212-flutter/versions/stable
Then installed the file manually as described here :
https://stackoverflow.com/a/17358862/1836827

And it works :-)

Stick with setExceptionPauseMode for older SDKs

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Debugger stuck on waiting for connection from debug service on chrome when trying to run on web using Flutter 2.x #4370

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Debugger stuck on waiting for connection from debug service on chrome when trying to run on web using Flutter 2.x #4370

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DanTup commented on Feb 1, 2023

felipefranca824 commented on Feb 2, 2023

DanTup commented on Feb 2, 2023

felipefranca824 commented on Feb 2, 2023

DanTup commented on Feb 2, 2023

felipefranca824 commented on Feb 2, 2023

DanTup commented on Feb 7, 2023

psimondk commented on Feb 11, 2023

DanTup commented on Feb 13, 2023

DanTup commented on Feb 13, 2023

psimondk commented on Feb 19, 2023

lbevilacqua commented on Feb 22, 2023

sperochon commented on Apr 20, 2023

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