Can't start DevTools from VS Code: Dart DevTools exited with code 66

Hi there,

I get “code 66” error when trying to start DevTools from VS Code. Here’s my log:

Dart Code extension: 3.9.1
Flutter extension: 3.9.1 (not activated)
VS Code: 1.44.2
Platform: linux
Workspace type: Flutter
Multi-root?: false
Dart SDK:
    Loc: /home/machine/tools/flutter/bin/cache/dart-sdk
    Ver: 2.7.2
Flutter SDK:
    Loc: /home/machine/tools/flutter
    Ver: 1.12.13+hotfix.9
HTTP_PROXY: undefined
NO_PROXY: undefined

Mon Apr 27 2020 [13:26:30 ...] Log file started
[13:26:36] [CommandProcesses] [Info] (PROC 11029) Logging data for process...
[13:26:37] [CommandProcesses] [Info] (PROC 11029) devtools 0.2.3
[13:26:37] [CommandProcesses] [Info] (PROC 11029) exited (0, null)
[13:26:37] [CommandProcesses] [Info] (PROC 11029) closed (0, null)
[13:26:37] [DevTools] [Info] Spawning /home/machine/tools/flutter/bin/cache/dart-sdk/bin/pub with args ["global","run","devtools","--machine","--enable-notifications","--try-ports","10"]
[13:26:37] [DevTools] [Info] ..  with {"toolEnv":{"FLUTTER_HOST":"VSCode","PUB_ENVIRONMENT":"vscode.dart-code"}}
[13:26:37] [DevTools] [Info]     PID: 6638
[13:26:37] [DevTools] [Error] Could not find a file named "pubspec.yaml" in "/home/machine/.pub-cache/hosted/pub.dartlang.org/devtools-0.2.3".
[13:26:37] [DevTools] [Info] Process terminated! 66, null
[13:26:37] [General] [Error] Dart DevTools exited with code 66
[13:26:37] [General] [Error] Dart DevTools exited with code 66
Mon Apr 27 2020 [13:26:41 ...] Log file ended

I followed the steps in #2128 and deactivated then reactivated devtools. What I noticed though was that it’s looking for the pubspec.yaml file in ~/.pub-cache/hosted/pub.dartlang.org/devtools-0.2.3 but the directory ~/.pub-cache/hosted does not exist.

I did have issues with my flutter environment a while back, and may have removed ~/.pub-cache/hosted to fix my dependencies, but I can’t remember for sure. It was a long day and my caffeine levels were dangerously low!

Any idea on how I could fix this? Thanks!

[crendo]

I had this issue. [SOLVED] as follow:

dart pub cache repair dart pub cache add devtools dart pub cache repair dart pub global activate devtools dart pub global run devtools (to check it’s working)

[ZaferAlemdaroglu]

i have same problem. Commands from terminal did not work.

=>flutter pub global list devtools 0.2.4

=>flutter pub global deactivate devtools Deactivated package devtools 0.2.4.

=>flutter pub global activate devtools Downloading… Precompiling executables… Precompiled devtools:devtools. Installed executable devtools. Activated devtools 0.2.4.

=>flutter pub global run devtools

Unhandled exception:
Invalid argument(s): A directory corresponding to fileSystemPath "...Flutter/flutter/.pub-cache/hosted/pub.dartlang.org/devtools-0.2.4/build" could not be found

#0      createStaticHandler (package:shelf_static/src/static_handler.dart:50:5)
#1      defaultHandler (package:devtools_server/src/external_handlers.dart:41:23)
<asynchronous suspension>
#2      serveDevTools (package:devtools_server/src/server.dart:211:21)
#3      serveDevToolsWithArgs (package:devtools_server/src/server.dart:149:10)
#4      main (file:///Users/zaferyasinalemdaroglu/Desktop/Flutter/flutter/.pub-cache/hosted/pub.dartlang.org/devtools-0.2.4/bin/devtools.dart:9:3)
#5      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:305:32)
#6      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
pub finished with exit code 255