I write a message and click send button my console show is this message given below?? message not append??

[sixfacearu]

W/RepoOperation(23256): setValue at /items/-LMzVJ04UO8LIcED0YeX failed: DatabaseError: Permission denied E/flutter (23256): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception: E/flutter (23256): PlatformException(-3, Permission denied, ) E/flutter (23256): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:551:7) E/flutter (23256): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:279:18) E/flutter (23256): E/flutter (23256): #2 DatabaseReference.set (file:///D:/ANDROID-FLUTTER/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_database-0.4.6/lib/src/database_reference.dart:74:31) E/flutter (23256): #3 HomeState.handleSubmit (file:///D:/FLUTTER_PROJECTS/realapp/lib/main.dart:66:22) E/flutter (23256): #4 HomeState.build. (file:///D:/FLUTTER_PROJECTS/realapp/lib/main.dart:106:25) E/flutter (23256): #5 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:503:14) E/flutter (23256): #6 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:558:30) E/flutter (23256): #7 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24) E/flutter (23256): #8 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9) E/flutter (23256): #9 TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7) E/flutter (23256): #10 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9) E/flutter (23256): #11 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12) E/flutter (23256): #12 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11) E/flutter (23256): #13 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:143:19) E/flutter (23256): #14 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22) E/flutter (23256): #15 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7) E/flutter (23256): #16 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7) E/flutter (23256): #17 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7) E/flutter (23256): #18 _invoke1 (dart:ui/hooks.dart:142:13) E/flutter (23256): #19 _dispatchPointerDataPacket (dart:ui/hooks.dart:99:5) W/IInputConnectionWrapper(23256): finishComposingText on inactive InputConnection W/IInputConnectionWrapper(23256): getTextBeforeCursor on inactive InputConnection