Launching lib/main_stag.dart on iPhone SE (2nd generation) in debug mode...
Running pod install...
Unhandled exception:
Unsupported operation: serialization of generic DartType: UnknownType(?) (UnknownType)
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�[38;5;248m#99     IncrementalSerializer.serialize  (package:front_end/src/fasta/incremental_serializer.dart:308:13)�[39;49m
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�[38;5;244m#109    _EventSinkWrapper.add  (dart:async/stream_transformers.dart:15:11)�[39;49m
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�[38;5;244m#118    _SinkTransformerStreamSubscription._add  (dart:async/stream_transformers.dart:69:11)�[39;49m
�[38;5;244m#119    _EventSinkWrapper.add  (dart:async/stream_transformers.dart:15:11)�[39;49m
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�[38;5;244m#138    _StreamController.add  (dart:async/stream_controller.dart:624:5)�[39;49m
�[38;5;244m#139    new _RawSocket.<anonymous closure>  (dart:io-patch/socket_patch.dart:1556:33)�[39;49m
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�[38;5;244m#142    _startMicrotaskLoop  (dart:async/schedule_microtask.dart:50:5)�[39;49m
�[38;5;244m#143    _runPendingImmediateCallback  (dart:isolate-patch/isolate_patch.dart:118:13)�[39;49m
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the Dart compiler exited unexpectedly.
the Dart compiler exited unexpectedly.
Exited (1)