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Facing this error while installing new packages and also while running commands

Facing this error while installing new packages and also while running commands.

I tried upgrading Flutter and Dart but the issue is still not solved.

I’m a beginner in flutter and do not have much knowledge about it.

I want you to see the error in pictures and help me in sorting out the problem!

Here is the code:

import 'package:flutter/material.dart';
void main() {
  runApp(MyApp(), );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(debugShowCheckedModeBanner
                       : false, title
                       : 'Flutter Demo',
                       // theme: ThemeData(
                       //   primarySwatch: Colors.blue,
                       // ),
                       home
                       : MyHomePage(), );
  }
}

class MyHomePage extends StatelessWidget {
  var nameController = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
        title: Text('Shared Preferences'),
    ),
    body: Container(
    child: Column(
    children: [
    TextField(
    controller: nameController,
    decoration: InputDecoration(
    label: Text('Name'),
    border: OutlineInputBorder(
    borderRadius: BorderRadius.circular(21),
    ),
    ),
    ),
    SizedBox(
    height: 11,
    ),
    OutlinedButton(
    onPressed: ()  {
      var name = nameController.text.toString();
    child: Text('Save'),),
    ],
    ),
    ),
    );
    }
  }