[Flutter] type 'int' is not a subtype of type 'String' in type cast when sending a post request

I have a weird error showing up when sending a post request.

// this map is passed to a function
final Map<String, dynamic> activityData = {
"userId": 1,
"name": activityName.text,
"description": activityDescription.text,
"startAt": activityStartAt.text,
"endsAt": activityEndAt.text,
"lat": _latitude,
"long": _longitude,
"category": 2,
"status": "pending"
};

// this code bellow is inside a async function
final http.Response response =
await http.post(Uri.encodeFull(url), body: activityData);


this is the error :

E/flutter (32582): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception:
E/flutter (32582): type 'int' is not a subtype of type 'String' in type cast
E/flutter (32582): #0 CastMap.forEach.<anonymous closure> (dart:_internal/cast.dart:286:25)
E/flutter (32582): #1 __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.forEach (dart:collection/runtime/libcompact_hash.dart:370:8)
E/flutter (32582): #2 CastMap.forEach (dart:_internal/cast.dart:285:13)
E/flutter (32582): #3 mapToQuery (package:http/src/utils.dart:17:7)
E/flutter (32582): #4 Request.bodyFields= (package:http/src/request.dart:128:17)
E/flutter (32582): #5 BaseClient._sendUnstreamed (package:http/src/base_client.dart:163:17)
E/flutter (32582): <asynchronous suspension>
E/flutter (32582): #6 BaseClient.post (package:http/src/base_client.dart:54:7)
E/flutter (32582): #7 post.<anonymous closure> (package:http/http.dart:70:16)
E/flutter (32582): #8 _withClient (package:http/http.dart:166:20)
E/flutter (32582): <asynchronous suspension>
E/flutter (32582): #9 post (package:http/http.dart:69:5)
E/flutter (32582): #10 _MainModel&Model&ConnectedModel&UsersModel&ActivitiesModel.createActivity (package:activmap/scoped-models/connectedModel.dart:62:15)
E/flutter (32582): <asynchronous suspension>
E/flutter (32582): #11 _NewActivityState.save (package:activmap/pages/newActivity.dart:271:11)
E/flutter (32582): <asynchronous suspension>
E/flutter (32582): #12 _NewActivityState.build.<anonymous closure> (package:activmap/pages/newActivity.dart:248:30)
E/flutter (32582): #13 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
E/flutter (32582): #14 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
E/flutter (32582): #15 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter (32582): #16 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
E/flutter (32582): #17 TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
E/flutter (32582): #18 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter (32582): #19 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter (32582): #20 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter (32582): #21 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:180:19)
E/flutter (32582): #22 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
E/flutter (32582): #23 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
E/flutter (32582): #24 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (32582): #25 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
E/flutter (32582): #26 _invoke1 (dart:ui/hooks.dart:168:13)
E/flutter (32582): #27 _dispatchPointerDataPacket (dart:ui/hooks.dart:122:5)


I have it working fine on another screen the only difference that I can see is that the one that's working only have Strings, while this one has int, double and String.

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