vss-web-extension-sdk package not working with React - azure-devops

I am trying to use vss-web-extension-sdk package with react but its giving me error.
Getting the below error:
Module not found: Error: Can't resolve 'vss-web-extension-sdk'

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Flutter english_words unused_import error

I'm new to flutter and I'm getting the above error:
Unused import: package:english_words/english_words.dart
I don't understand why I am getting an error.
What should I do?
This is referring you didn't use the package. You can remove the import (line 1) if you dont use the package on this file. Or you can ignore it for now.
You can find more about linter-rules and flutter_lints.

Flutter Redux Navigation library import error

I have been developing application and one of the libraries I have used was Flutter Redux Navigation. Everything was working fine, until recently, when I started getting following error
../../lib/src/navigation_middleware.dart:3:1: Error: 'NavigationDestination' is imported from both 'package:flutter/src/material/navigation_bar.dart' and 'package:flutter_redux_navigation/src/navigation_destination.dart'.
import 'package:flutter_redux_navigation/src/navigation_destination.dart';
^^^^^^^^^^^^^^^^^^^^^
../../lib/src/navigation_middleware.dart:35:26: Error: 'NavigationDestination' is imported from both 'package:flutter/src/material/navigation_bar.dart' and 'package:flutter_redux_navigation/src/navigation_destination.dart'.
this._setState(NavigationDestination(
^^^^^^^^^^^^^^^^^^^^^
../../lib/src/navigation_middleware.dart:55:26: Error: 'NavigationDestination' is imported from both 'package:flutter/src/material/navigation_bar.dart' and 'package:flutter_redux_navigation/src/navigation_destination.dart'.
this._setState(NavigationDestination(
I even tried to copy example project from their git, and got exactly same error. This is something in library, or perhaps some settings of my IDE? Please let me know if anyone encountered this error.
The problem was that I have upgraded Flutter version from 2.5.1 to 2.8.0. The newest Flutter version contains upgraded Material library, which contains the method called NavigationDestination. Thus both, the library and Material design have the same name of the class, of course, resulting in error.

i'm having this error with the flutter version for web each time i try to test it. But it works fine on mobile

Everything works fine and App is already in the play store but when i try to test for a web version it produces below error just for this particular App.
I want to know what is exactly wrong
lib/main.dart:15:8: Error: Error when reading
'lib/generated_plugin_registrant.dart': The system cannot find the
file specified.
import 'package:[NameOfApp goes
here]/generated_plugin_registrant.dart';
^ lib/main.dart:16:8: Error: Error when reading 'lib/generated_plugin_registrant.dart': The system cannot find the
file specified.
org-dartlang-app:/web_entrypoint.dart:11:3: Error: Method not found: 'registerPlugins'.
registerPlugins(webPluginRegistry);
^^^^^^^^^^^^^^^
Failed to compile application.

Get Error in WebGL: ReferenceError: $ is not defined

I have Unity project created in Unity 5.2.3. I open this project in Unity 5.3.3p3 and compile for WebGl and get error: Invoking error handler due to
ReferenceError: $ is not defined.
I find answer: in my code was line: Application.ExternalCall("$('#ViewerBox').data('unityViewer')." + method, values);
With symbol $

error: package ******.******.***** does not exist

Play Framework localhost:9000 result:
error: package com.achimala.leaguelib.connection does not exist
The line of code in question is as follows:
import com.achimala.leaguelib.connection.LeagueAccount;
Am I calling the import improperly?..Do I need some identifier somewhere?