[DevTool]Unable to connect to VM service

[aboutlan]

I ran into a problem when i opened DevTools ? And now I can't debug widget. How can i solve it. Thanks a lot !

$ flutter doctor -v
[✓] Flutter (Channel unknown, 1.22.4, on macOS 11.0.1 20B29 darwin-x64, locale
zh-Hans-CN)
• Flutter version 1.22.4 at /Users/xangam/Documents/Develop/flutter
• Framework revision 1aafb3a (3 months ago), 2020-11-13 09:59:28 -0800
• Engine revision 2c956a31c0
• Dart version 2.10.4
• 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 30.0.3)
• Android SDK at /Users/xangam/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 12.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.2, Build version 12B45b
• CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build
1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.52.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.19.0

[✓] Connected device (2 available)
• iPhone 12 Pro Max (mobile) • 91C9D3D1-D807-4858-9464-03BA4F2A7396 • ios •
com.apple.CoreSimulator.SimRuntime.iOS-14-2 (simulator)
• iPhone8_13 (mobile) • AA2359D5-F041-4CE5-87D1-C0C7AD105A85 • ios •
com.apple.CoreSimulator.SimRuntime.iOS-13-0 (simulator)

! Doctor found issues in 1 category.

$flutter pub global activate devtools
Package devtools is currently active at version 0.9.7.
Resolving dependencies...

• args 1.6.0
• async 2.4.2
• browser_launcher 0.1.8
• charcode 1.1.3
• collection 1.14.13
• convert 2.1.1
• devtools 0.9.7
• devtools_server 0.9.7
• devtools_shared 0.9.7
• http 0.12.2
• http_multi_server 2.2.0
• http_parser 3.1.4
• intl 0.16.1
• logging 0.11.4
• meta 1.2.4
• mime 0.9.7
• path 1.7.0
• pedantic 1.9.2
• shelf 0.7.9
• shelf_proxy 0.1.0+7
• shelf_static 0.2.9+2
• source_span 1.7.0
• sse 3.6.1
• stack_trace 1.9.6
• stream_channel 2.0.0
• string_scanner 1.0.5
• term_glyph 1.1.0
• typed_data 1.2.0
• usage 3.4.2
• vm_service 5.5.0
• webkit_inspection_protocol 0.7.4
  Precompiling executables...
  Precompiled devtools:devtools.
  Installed executable devtools.
  Activated devtools 0.9.7.

[eli1stark]

I have exactly the same issue at 1.22.5 and 1.22.6

[yuke27]

me too

[eli1stark]

I also noticed that my automatic Hot Reload in VSCode suddenly stopped working. I don't know if this somehow relates to this but it was working several days ago. Please like the issue to get more attention👍

[marvinpowellprivate]

I have the same issue with 1.22.6

[nelcab]

I have the same issue with 1.22.6, 1.22.5 and 1.22.4. I even uninstall the Flutter SDK and installed again and the problems persist.
Using IntelliJ and VSCode and on both got the same problem. Using latest plugins and also rolling back to one before.

[FireFoxG]

Got the same issue today. After digging a for some time I found that it's most likely related to newest Devtools that were released (0.9.7). Since we get latest Devtools installed automatically for some reason...

I'm running Windows 10, and after checking where Dart stores its dependencies and cache I found that
%LOCALAPPDATA%\Pub\Cache\global_packages\devtools\bin
contains two versions of devtools for me
devtools.dart-2.10.5.snapshot - obviously for freshly released Dart 2.10.5
devtools.dart-2.10.4.snapshot

Even though my Dart version got finally updated to 2.10.5, I still have the same issue, so I temporary solved it by downgrading the Devtools that are being used:

1. %LOCALAPPDATA%\Pub\Cache\global_packages\devtools\bin\.packages
   Changed all 3 devtools related dependecies to lower version (in my case 0.9.3+4, but can be other version in
   your case, check which one you have cached in %LOCALAPPDATA%\Pub\Cache\hosted\pub.dartlang.org)

devtools-0.9.7 -> devtools-0.9.3+4
devtools_server-0.9.7 -> devtools_server-0.9.3+4
devtools_shared-0.9.7 -> devtools_shared-0.9.3+4

2. Set .packages file to read-only
3. Restart your IDE

[tgoyal63]

I am also getting the same error from past 10 hours. I tried updating the dev tolls and restarted the server also. Nothing worked!

[joaomrsouza]

Same issue here!

[grandslammer]

+1.
Issue occurs in Android Studio, VS Code, and when opening Dart DevTools in the browser from VS Code.

Also occurs when running the app on an emulator and on a physical device. The same message is shown in the Inspector window for all of them.

I have checked everything I can, and have Googled the issue. Other people are having similar issues with DevTools, but not this specific one from what I've found. I've tried some solutions which I thought could be relevant - nothing has worked.

This was not happening the last time I used Flutter a couple of months ago. I have installed the latest updates since. Other than that, no changes on my end.

[stkuwanda]

I have exactly the same issue at 1.22.5 and 1.22.6

having the exact same issues with both these versions with both vscode and android studio

[aboutlan]

@FireFoxG Downgrading version may be a good idea. Because I found that error message is xxx method not found，I guess this error may be about DevTools’s version.

[erikd234]

Just updated today and my dev tools stopped working exactly like they did for the OP.

[Marc-Viernes]

I have the same issue as well after I updated to 1.22.6.

[airingursb]

You can see the same issue here: devtools/issues/2648