"Exception from the Dart analysis server" on start up

Describe the bug Crash on start up, VS Code integration then doesn’t work fully anymore (e.g. formatting works, but no auto-complete/linting).

To Reproduce

Open our internal app project, a VS Code Workspace.

Expected behavior Initializes normally, as it did for over a year.

Screenshots

Versions (please complete the following information):

Error log:

### Request

Server was responding to request: `analysis.setAnalysisRoots`

### Versions

- Visual Studio Code v1.59.1
- Dart Code v3.25.1
- Flutter SDK v1.22.6

### Analyzer Info

The analyzer was launched using the arguments:

- /Users/timm-l1/Downloads/flutter/bin/cache/dart-sdk/bin/snapshots/analysis_server.dart.snapshot
- --client-id=VS-Code
- --client-version=3.25.1

### Exception

type '_OverlayFolder' is not a subtype of type 'File'

#0      ContextManagerImpl._findPackageSpecFile (package:analysis_server/src/context_manager.dart:1093:5)
#1      ContextManagerImpl._createContexts (package:analysis_server/src/context_manager.dart:998:23)
#2      ContextManagerImpl.setRoots (package:analysis_server/src/context_manager.dart:610:9)
#3      AnalysisServer.setAnalysisRoots (package:analysis_server/src/analysis_server.dart:398:22)
#4      AnalysisDomainHandler.setAnalysisRoots (package:analysis_server/src/domain_analysis.dart:350:14)
#5      AnalysisDomainHandler.handleRequest (package:analysis_server/src/domain_analysis.dart:289:16)
#6      AnalysisServer.handleRequest.<anonymous closure> (package:analysis_server/src/analysis_server.dart:239:38)
#7      _rootRun (dart:async/zone.dart:1190:13)
#8      _CustomZone.run (dart:async/zone.dart:1093:19)
#9      _runZoned (dart:async/zone.dart:1630:10)
#10     runZonedGuarded (dart:async/zone.dart:1618:12)
#11     AnalysisServer.handleRequest (package:analysis_server/src/analysis_server.dart:235:5)
#12     ByteStreamServerChannel._readRequest (package:analysis_server/src/channel/byte_stream_channel.dart:163:14)
#13     ByteStreamServerChannel.listen.<anonymous closure> (package:analysis_server/src/channel/byte_stream_channel.dart:103:26)
#14     _rootRunUnary (dart:async/zone.dart:1198:47)
#15     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#19     _SinkTransformerStreamSubscription._add (dart:async/stream_transformers.dart:69:11)
#20     _EventSinkWrapper.add (dart:async/stream_transformers.dart:15:11)
#21     _StringAdapterSink.add (dart:convert/string_conversion.dart:238:11)
#22     _LineSplitterSink._addLines (dart:convert/line_splitter.dart:155:13)
#23     _LineSplitterSink.addSlice (dart:convert/line_splitter.dart:130:5)
#24     StringConversionSinkMixin.add (dart:convert/string_conversion.dart:163:5)
#25     _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:121:24)
#26     _rootRunUnary (dart:async/zone.dart:1198:47)
#27     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#28     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#29     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#30     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#31     _SinkTransformerStreamSubscription._add (dart:async/stream_transformers.dart:69:11)
#32     _EventSinkWrapper.add (dart:async/stream_transformers.dart:15:11)
#33     _StringAdapterSink.add (dart:convert/string_conversion.dart:238:11)
#34     _StringAdapterSink.addSlice (dart:convert/string_conversion.dart:243:7)
#35     _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:317:20)
#36     _Utf8ConversionSink.add (dart:convert/string_conversion.dart:310:5)
#37     _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:72:18)
#38     _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:121:24)
#39     _rootRunUnary (dart:async/zone.dart:1198:47)
#40     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#41     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#42     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#43     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#44     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:808:19)
#45     _StreamController._add (dart:async/stream_controller.dart:682:7)
#46     _StreamController.add (dart:async/stream_controller.dart:624:5)
#47     _Socket._onData (dart:io-patch/socket_patch.dart:2044:41)
#48     _rootRunUnary (dart:async/zone.dart:1206:13)
#49     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
#50     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
#51     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:357:11)
#52     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:285:7)
#53     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:808:19)
#54     _StreamController._add (dart:async/stream_controller.dart:682:7)
#55     _StreamController.add (dart:async/stream_controller.dart:624:5)
#56     new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1580:33)
#57     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1076:14)
#58     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#59     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#60     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#61     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

[tp]

Sounds reasonable. Thanks for your support.

Indeed we’re looking into moving to Flutter 2.x first without NNBD which shouldn’t be a major task, we’re just getting started a bit “late”.

If I find any workaround / solution for my current other than open individual editors, I will update the thread here.

[DanTup]

Do you think there could be any inadvertent side-effect of opening a project with a Flutter 2.x SDK which now affects this project?

I wouldn’t expect so, although depending on how you’re switching between SDKs, is it possible you have an inconsistent SDK with some files from each?

Unfortunately there’s not much that can be done if it’s legitimately a bug in the older SDK, as any fixes would only be available in newer versions anyway.

I’m not familiar with the changes required to migrate to Flutter 2.0, but if null-safety is the large part of the work you have, my understanding was that it’s possible to upgrade to Flutter 2.0 without using sound null safety, so that might not be as big a job as migrating to null safety. (I’m not familiar with what other breaking changes there may be in the upgrade though).