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

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)

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

hi @DanTup - I have the same error and tried your commands. Here is the result:

anthony@Anthonys-MacBook-Air ~ % flutter pub global list devtools 0.2.3 anthony@Anthonys-MacBook-Air ~ % flutter pub global deactivate devtools Deactivated package devtools 0.2.3. anthony@Anthonys-MacBook-Air ~ % flutter pub global activate devtools Resolving dependencies…

• args 1.6.0
• async 2.4.1
• browser_launcher 0.1.5
• charcode 1.1.3
• collection 1.14.12
• convert 2.1.1
• crypto 2.1.4
• devtools 0.2.3 (0.2.4-dev.1 available)
• devtools_server 0.2.3 (0.2.4-dev.1 available)
• devtools_shared 0.2.3 (0.2.4-dev.1 available)
• http 0.12.1
• http_multi_server 2.2.0
• http_parser 3.1.4
• intl 0.16.1
• logging 0.11.4
• meta 1.1.8
• mime 0.9.6+3
• path 1.7.0
• pedantic 1.9.0
• shelf 0.7.5 anthony@Anthonys-MacBook-Air ~ % flutter pub global list devtools 0.2.3 anthony@Anthonys-MacBook-Air ~ % flutter pub global deactivate devtools Deactivated package devtools 0.2.3. anthony@Anthonys-MacBook-Air ~ % flutter pub global activate devtools Resolving dependencies…
• args 1.6.0
• async 2.4.1
• browser_launcher 0.1.5
• charcode 1.1.3
• collection 1.14.12
• convert 2.1.1
• crypto 2.1.4
• devtools 0.2.3 (0.2.4-dev.1 available)
• devtools_server 0.2.3 (0.2.4-dev.1 available)
• devtools_shared 0.2.3 (0.2.4-dev.1 available)
• http 0.12.1
• http_multi_server 2.2.0
• http_parser 3.1.4
• intl 0.16.1
• logging 0.11.4
• meta 1.1.8
• mime 0.9.6+3
• path 1.7.0
• pedantic 1.9.0
• shelf 0.7.5
• shelf_static 0.2.8
• source_span 1.7.0
• sse 3.5.0
• stack_trace 1.9.3
• stream_channel 2.0.0
• string_scanner 1.0.5
• term_glyph 1.1.0
• typed_data 1.1.6
• usage 3.4.1
• uuid 2.0.4
• vm_service 3.0.0+1 (4.0.2 available)
• webkit_inspection_protocol 0.5.0+1 Precompiling executables… Precompiled devtools:devtools. Installed executable devtools. Activated devtools 0.2.3. anthony@Anthonys-MacBook-Air ~ % flutter pub global run devtools
  Serving DevTools at http://127.0.0.1:9100

I’m getting the same issue as well.

~  flutter pub global list
devtools 0.2.4
~  flutter pub global deactivate devtools
Deactivated package devtools 0.2.4.
~  flutter pub global activate devtools
Resolving dependencies...
+ args 1.6.0
+ async 2.4.1
+ browser_launcher 0.1.5
+ charcode 1.1.3
+ collection 1.14.12
+ convert 2.1.1
+ crypto 2.1.4
+ devtools 0.2.4
+ devtools_server 0.2.4
+ devtools_shared 0.2.4
+ http 0.12.1
+ http_multi_server 2.2.0
+ http_parser 3.1.4
+ intl 0.16.1
+ logging 0.11.4
+ meta 1.1.8
+ mime 0.9.6+3
+ path 1.7.0
+ pedantic 1.9.0
+ shelf 0.7.5
+ shelf_proxy 0.1.0+7
+ shelf_static 0.2.8
+ source_span 1.7.0
+ sse 3.5.0
+ stack_trace 1.9.3
+ stream_channel 2.0.0
+ string_scanner 1.0.5
+ term_glyph 1.1.0
+ typed_data 1.1.6
+ usage 3.4.1
+ uuid 2.0.4
+ vm_service 4.0.2
+ webkit_inspection_protocol 0.5.2
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 "/Users/gui.lazzaris/.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/gui.lazzaris/.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

@santhonydo great! My guess is that something happened to your pub cache (I see this a lot, as I often delete it when I hit weird issues), and reinstalling would’ve fixed it (~/tools/flutter/bin/cache/dart-sdk/bin/pub cache repair probably would’ve also worked, but could also be a lot slower if you have a lot of packages in there).

@lukevenediger please let me know if you’re still seeing this and the steps above don’t help.

@santhonydo looks like the commands you ran were different to the ones I posted:

~/tools/flutter/bin/cache/dart-sdk/bin/pub global activate devtools

vs

anthony@Anthonys-MacBook-Air ~ % flutter pub global activate devtools

VS Code always uses pub for DevTools and not flutter. Please try re-running them as above, and let me know if that solves the issue or you have any errors.