SDD flutter run error

gistfile1.txt

$ flutter run -d chrome -t lib/main_web.dart
Launching lib/main_web.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...             42.8s
This app is linked to the debug service: ws://127.0.0.1:55567/wZ6RSqLPwm0=/ws
Debug service listening on ws://127.0.0.1:55567/wZ6RSqLPwm0=/ws

Running with unsound null safety
For more information see https://dart.dev/null-safety/unsound-null-safety

  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".

An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:55567/wZ6RSqLPwm0=
Error: Unsupported operation: StdIOUtils._getStdioOutputStream
    at Object.throw_ [as throw] (http://localhost:52578/dart_sdk.js:5376:11)
    at Function._getStdioOutputStream (http://localhost:52578/dart_sdk.js:60599:17)
    at Object.get stderr [as stderr] (http://localhost:52578/dart_sdk.js:61037:107)
    at dotenv.DotEnv._internal.get env [as env] (http://localhost:52578/packages/flutter_dotenv/src/dotenv.dart.lib.js:49:12)
    at Function.release (http://localhost:52578/packages/smart_duel_disk/packages/core/core_config/core_config_interface/lib/src/models/app_config.dart.lib.js:77:100)
    at main (http://localhost:52578/packages/smart_duel_disk/main_web.dart.lib.js:20:46)
    at main.next (<anonymous>)
    at http://localhost:52578/dart_sdk.js:39801:33
    at _RootZone.runUnary (http://localhost:52578/dart_sdk.js:39658:58)
    at _FutureListener.thenAwait.handleValue (http://localhost:52578/dart_sdk.js:34587:29)
    at handleValueCallback (http://localhost:52578/dart_sdk.js:35172:49)
    at Function._propagateToListeners (http://localhost:52578/dart_sdk.js:35210:17)
    at _Future.new.[_completeWithValue] (http://localhost:52578/dart_sdk.js:35052:23)
    at async._AsyncCallbackEntry.new.callback (http://localhost:52578/dart_sdk.js:35075:35)
    at Object._microtaskLoop (http://localhost:52578/dart_sdk.js:39963:13)
    at _startMicrotaskLoop (http://localhost:52578/dart_sdk.js:39969:13)
    at http://localhost:52578/dart_sdk.js:35434:9
The Flutter DevTools debugger and profiler on Chrome is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:55567/wZ6RSqLPwm0=