Fehler beim öffnen der Agenda Seite about morea HOT 4 CLOSED

E/flutter ( 7126): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(error, Invalid document reference. Document references must have an even number of segments, but groups has 1, null)
E/flutter ( 7126): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
E/flutter ( 7126): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:316:33)
E/flutter ( 7126): <asynchronous suspension>
E/flutter ( 7126): #2      DocumentReference.snapshots.<anonymous closure> (package:cloud_firestore/src/document_reference.dart:127:37)
E/flutter ( 7126): #3      _runGuarded (dart:async/stream_controller.dart:805:24)
E/flutter ( 7126): #4      _BroadcastStreamController._subscribe (dart:async/broadcast_stream_controller.dart:213:7)
E/flutter ( 7126): #5      _ControllerStream._createSubscription (dart:async/stream_controller.dart:818:19)
E/flutter ( 7126): #6      _StreamImpl.listen (dart:async/stream_impl.dart:472:9)
E/flutter ( 7126): #7      _StreamIterator._initializeOrDone (dart:async/stream_impl.dart:1004:30)
E/flutter ( 7126): #8      _StreamIterator.moveNext (dart:async/stream_impl.dart:991:12)
E/flutter ( 7126): #9      Agenda.getAgendaOverview (package:morea/services/agenda.dart)
E/flutter ( 7126): <asynchronous suspension>
E/flutter ( 7126): #10     Agenda.addToList (package:morea/services/agenda.dart:45:62)
E/flutter ( 7126): <asynchronous suspension>
E/flutter ( 7126): #11     Agenda.getTotalAgendaOverview (package:morea/services/agenda.dart:77:7)
E/flutter ( 7126): <asynchronous suspension>
E/flutter ( 7126): #12     _AgendaStatePage._getAgenda (package:morea/Pages/Agenda/Agenda_page.dart:66:19)
E/flutter ( 7126): <asynchronous suspension>
E/flutter ( 7126): #13     _AgendaStatePage.Agenda (package:morea/Pages/Agenda/Agenda_page.dart:336:17)
E/flutter ( 7126): #14     _AgendaStatePage.build (package:morea/Pages/Agenda/Agenda_page.dart:306:15)
E/flutter ( 7126): #15     StatefulElement.build (package:flutter/src/widgets/framework.dart:4047:27)
E/flutter ( 7126): #16     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3941:15)
E/flutter ( 7126): #17     Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
E/flutter ( 7126): #18     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3924:5)
E/flutter ( 7126): #19     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4088:11)
E/flutter ( 7126): #20     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3919:5)
E/flutter ( 7126): #21     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3101:14)
E/flutter ( 7126): #22     Element.updateChild (package:flutter/src/widgets/framework.dart:2904:12)
E/flutter ( 7126): #23     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3961:16)
E/flutter ( 7126): #24     Element.rebuild (package:flutter/src/widgets/framework.dart:3738:5)
E/flutter ( 7126): #25     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2348:33)
E/flutter ( 7126): #26     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:760:20)
E/flutter ( 7126): #27     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:280:5)
E/flutter ( 7126): #28     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1033:15)
E/flutter ( 7126): #29     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:975:9)
E/flutter ( 7126): #30     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:891:5)
E/flutter ( 7126): #31     _rootRun (dart:async/zone.dart:1124:13)
E/flutter ( 7126): #32     _CustomZone.run (dart:async/zone.dart:1021:19)
E/flutter ( 7126): #33     _CustomZone.runGuarded (dart:async/zone.dart:923:7)
E/flutter ( 7126): #34     _invoke (dart:ui/hooks.dart:249:10)
E/flutter ( 7126): #35     _drawFrame (dart:ui/hooks.dart:207:3)