den fetch autocomplete throws without pubspec

[mockturtl]

~ $ den fetch dar^IUnhandled exception:
Uncaught Error: Invalid argument(s): No package root (containing pubspec.yaml) found in hierarchy of path: /home/me
Stack Trace:
#0      Pubspec._getPackageRoot (package:den_api/src/pubspec.dart:336)
#1      Pubspec.load (package:den_api/src/pubspec.dart:187)
#2      getHostedDependencyNames (package:den/src/util.dart:40)
#3      _getCompletionsForAllowed.<anonymous closure> (package:unscripted/src/plugins/completion/usage_completion.dart:141)
#4      Future.Future.sync (dart:async/future.dart:168)
#5      _getCompletionsForAllowed (package:unscripted/src/plugins/completion/usage_completion.dart:139)
#6      getUsageCompletions.<anonymous closure> (package:unscripted/src/plugins/completion/usage_completion.dart:117)
#7      Future.Future.sync (dart:async/future.dart:168)
#8      getUsageCompletions (package:unscripted/src/plugins/completion/usage_completion.dart:11)
#9      _getCompletionOutput (package:unscripted/src/plugins/completion/completion.dart:158)
#10     CompletionAdapter._complete.<anonymous closure> (package:unscripted/src/plugins/completion/completion.dart:73)
#11     Future.Future.sync (dart:async/future.dart:168)
#12     CompletionAdapter._complete (package:unscripted/src/plugins/completion/completion.dart:64)
#13     CompletionAdapter.onParse (package:unscripted/src/plugins/completion/completion.dart:55)
#14     Completion.onParse (package:unscripted/src/plugins/completion/completion.dart:29)
#15     ScriptImpl.execute.<anonymous closure> (package:unscripted/src/script_impl.dart:34)
#16     ListIterable.every (dart:_internal/iterable.dart:78)
#17     ScriptImpl.execute (package:unscripted/src/script_impl.dart:34)
#18     main (http://localhost:49507/den.dart:6)
#19     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:259)
#20     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)

#0      _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:895)
#1      _microtaskLoop (dart:async/schedule_microtask.dart:43)
#2      _microtaskLoopEntry (dart:async/schedule_microtask.dart:52)
#3      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:149)