[carp_mobile-sensing] Unhandled Exception: Converting object to an encodable object failed: Instance of 'DataPoint'

[thomasnilsson]

How to re-create

1. Run the carp_mobile_sensing example app on Android
2. Tap the refresh button to make a sample
3. Error will occur in logs

Log output:

I/flutter (15411): AppUsageDatum - format: carp.app_usage, id: 90e7ab60-e4a5-11ea-b171-e315deff13b0, timestamp: 2020-08-22 18:30:34.005660Z, 2020-08-22 18:29:34.958190Z, end: 2020-08-22 18:30:33.959474Z, usage: {packageinstaller: 9.0, nexuslauncher: 1060.0, carp_mobile_sensing_example: 4.0, settings: 27.0, app_usage_example: 2474.0, app_usage_tester: 248.0, calendar: 4.0}
E/flutter (15411): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: Converting object to an encodable object failed: Instance of 'DataPoint'
E/flutter (15411): #0      _JsonStringifier.writeObject (dart:convert/json.dart:659:7)
E/flutter (15411): #1      _JsonStringStringifier.printOn (dart:convert/json.dart:846:17)
E/flutter (15411): #2      _JsonStringStringifier.stringify (dart:convert/json.dart:831:5)
E/flutter (15411): #3      JsonEncoder.convert (dart:convert/json.dart:260:30)
E/flutter (15411): #4      JsonCodec.encode (dart:convert/json.dart:168:45)
E/flutter (15411): #5      jsonEncode (dart:convert/json.dart:82:10)
E/flutter (15411): #6      FileDataManager.write (package:carp_mobile_sensing/data_managers/local/file_data_manager.dart:118:18)
E/flutter (15411): #7      FileDataManager.onDatum (package:carp_mobile_sensing/data_managers/local/file_data_manager.dart:52:32)
E/flutter (15411): #8      _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #9      _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #10     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #11     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #12     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter (15411): #13     _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:134:11)
E/flutter (15411): #14     _MapStream._handleData (dart:async/stream_pipe.dart:234:10)
E/flutter (15411): #15     _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:166:13)
E/flutter (15411): #16     _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #17     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #18     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #19     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #20     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter (15411): #21     _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:134:11)
E/flutter (15411): #22     _MapStream._handleData (dart:async/stream_pipe.dart:234:10)
E/flutter (15411): #23     _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:166:13)
E/flutter (15411): #24     _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #25     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #26     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #27     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #28     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter (15411): #29     _SyncBroadcastStreamController._sendData.<anonymous closure> (dart:async/broadcast_stream_controller.dart:386:20)
E/flutter (15411): #30     _BroadcastStreamController._forEachListener (dart:async/broadcast_stream_controller.dart:327:15)
E/flutter (15411): #31     _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:385:5)
E/flutter (15411): #32     _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:252:5)
E/flutter (15411): #33     _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #34     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #35     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #36     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #37     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter (15411): #38     _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:378:20)
E/flutter (15411): #39     _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:252:5)
E/flutter (15411): #40     _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #41     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #42     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #43     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #44     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:266:7)
E/flutter (15411): #45     _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:378:20)
E/flutter (15411): #46     _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:252:5)
E/flutter (15411): #47     _rootRunUnary (dart:async/zone.dart:1192:38)
E/flutter (15411): #48     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
E/flutter (15411): #49     _CustomZone.runUnaryGuarded (dart:async/zone.dart:987:7)
E/flutter (15411): #50     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339:11)
E/flutter (15411): #51     _DelayedData.perform (dart:async/stream_impl.dart:594:14)
E/flutter (15411): #52     _StreamIm

[bardram]

I cannot reproduce this. I don't get an error.

[bardram]

Fixed in version 0.9.3.