Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String'

E/flutter (29065): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: type ‘_InternalLinkedHashMap<String, dynamic>’ is not a subtype of type ‘String’
E/flutter (29065): #0 _MyHomePageState._incrementCounter (package:flutter_app/main.dart:39:52)
E/flutter (29065):
E/flutter (29065): #1 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:513:14)
E/flutter (29065): #2 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:568:30)
E/flutter (29065): #3 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:120:24)
E/flutter (29065): #4 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
E/flutter (29065): #5 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:204:7)
E/flutter (29065): #6 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (29065): #7 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:184:20)
E/flutter (29065): #8 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
E/flutter (29065): #9 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
E/flutter (29065): #10 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (29065): #11 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
E/flutter (29065): #12 _rootRunUnary (dart:async/zone.dart:1136:13)
E/flutter (29065): #13 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (29065): #14 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (29065): #15 _invoke1 (dart:ui/hooks.dart:203:10)
E/flutter (29065): #16 _dispatchPointerDataPacket (dart:ui/hooks.dart:138:5)
E/flutter (29065):

入参应该是String,你写成Map<String,dynamic> 了