Error in AndroidManifest.xml in Flutter App "Attribute class not Found"

AndroidManifest.xml showing me 10 errors in the code below. I am unable to understand why it is showing these errors and how can I resolve this. Help me out from these errors.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.buis_talk">

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

   <application
   android:requestLegacyExternalStorage="true"
        android:label="buis_talk"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:usesCleartextTraffic="true"
            
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

Errors are:-

1. android:requestLegacyExternalStorage="true" – "Attribute android:requestLegacyExternalStorage is not allowed here"
2. android:name="${applicationName}" – "Unresolvedclass:'{applicationName}’"
3. android:icon="@mipmap/ic_launcher"> – "Attribute android:icon is not allowed here"
4. android:name=".MainActivity" – "Unresolved class MainActivity"
5. android:usesCleartextTraffic="true" – "Attribute android:usesCleartextTraffic is not allowed here"
6. android:launchMode="singleTop" – "Attribute android:launchMode is not allowed here"
7. android:theme="@style/LaunchTheme" – "Attribute android:theme is not allowed here"
8. android:configChanges="….." – "Attribute android:configChanges is not allowed here"
9. android:hardwareAccelerated="true" – "Attribute android:hardwareAccelerated is not allowed here"
10. android:windowSoftInputMode="adjustResize"> – "Attribute android:windowSoftInputMode is not allowed here"