Solvedflutter type 'List<dynamic>' is not a subtype of type 'List<String>'

Restarted app in 2,687ms.
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_DOWN
I/flutter (20672): _MyAppState.activateSpeechRecognizer... 
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_UP
D/SpeechRecognitionPlugin(20672): Current Locale : en_GB
I/flutter (20672): _platformCallHandler call speech.onCurrentLocale en_GB
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_DOWN
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_UP
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_DOWN
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_UP
I/flutter (20672): Dislike
I/flutter (20672): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter (20672): The following assertion was thrown while handling a gesture:
I/flutter (20672): type 'List<dynamic>' is not a subtype of type 'List<String>'
I/flutter (20672): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (20672): more information in this error message to help you determine and fix the underlying cause.
I/flutter (20672): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (20672):   https://github.com/flutter/flutter/issues/new
I/flutter (20672): When the exception was thrown, this was the stack:
I/flutter (20672): #0      _ChatListTileItemState.build.<anonymous closure> (file:///Users/sahil/IdeaProjects/gabhub_anonym_text/lib/live_chat_tab_base.dart:429:85)
I/flutter (20672): #1      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
I/flutter (20672): #2      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
I/flutter (20672): #3      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
I/flutter (20672): #4      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
I/flutter (20672): #5      _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
I/flutter (20672): #6      _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
I/flutter (20672): #7      _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
I/flutter (20672): #8      _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
I/flutter (20672): #9      _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
I/flutter (20672): #10     _invoke1 (dart:ui/hooks.dart:134:13)
I/flutter (20672): #11     _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
I/flutter (20672): Handler: onTap
I/flutter (20672): Recognizer:
I/flutter (20672):   TapGestureRecognizer#cf6d7(debugOwner: GestureDetector, state: ready, won arena, finalPosition:
I/flutter (20672):   Offset(125.9, 380.8), sent tap down)
I/flutter (20672): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_DOWN
I/ViewRootImpl(20672): ViewRoot's Touch Event : ACTION_UP
24 Answers

✔️Accepted Answer

The problem is your fromMap constructor is reading from a Map<String, dynamic>, so I bet that all of the lists in that map are actually List<dynamic> or just dynamic. Try doing this instead:

List<String> likes;

LiveChat.fromMap(Map<String, dynamic> data) {
  likes = data['likes'].cast<String>();
}

Other Answers:

I did what @jonahwilliams suggested with the cast<Type>() and it was working nicely for a while. Though I encountered an error where if the value for the key in the map was null (e.g. not found) and threw the following error:

I/flutter (17982): The method 'cast' was called on null.
I/flutter (17982): Receiver: null
I/flutter (17982): Tried calling: cast<DocumentReference>()

with the following code

Object.fromMap(Map<String, dynamic> map, {this.reference})
    : readBy = map['readBy'].cast<DocumentReference>();

To fix this you can make an ugly inline null check:

readBy = (map['readBy'] != null) ? map['readBy'].cast<DocumentReference>() : null

But the cleaner and more Dartful way of accomplishing this is with the null-aware ?. operator:

readBy = map['readBy']?.cast<DocumentReference>()

Leaving this slight improvement here encase anyone else comes across this issue.

@sahil311289 this looks like a type error in your code, maybe see sound dart.

For example, you might be doing something like this:

List xs = ["asd", "dss"]; // list<dynamic>
taksesAListOfStrings(xs); // error List<dynamic> is not a subtype of List<String>

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