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AAPT: error: unexpected element <activity> found in <manifest><application><activity>

It specifies
ERROR:C:\Users\rafaw\OneDrive\Desktop\pp_rafa\pp_rafa\remindertest\app\build\intermediates\packaged_manifests\debug\AndroidManifest.xml:27: AAPT: error: unexpected element <activity> found in <manifest><application><activity>.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.remindertest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="21"
android:targetSdkVersion="31" />
<application
android:allowBackup="true"
android:appComponentFactory="androidx.core.app.CoreComponentFactory"
android:debuggable="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:testOnly="true"
android:theme="#style/Theme.ReminderTest" >
<activity
android:name="com.example.remindertest.Activity2"
android:exported="false" />
<activity
android:name="com.example.remindertest.MainActivity"
android:exported="true" >
<activity android:name="com.example.remindertest.DestinationActivity" />
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.example.remindertest.AlarmReceiver" />
<provider
android:name="androidx.startup.InitializationProvider"
android:authorities="com.example.remindertest.androidx-startup"
android:exported="false" >
<meta-data
android:name="androidx.emoji2.text.EmojiCompatInitializer"
android:value="androidx.startup" />
<meta-data
android:name="androidx.lifecycle.ProcessLifecycleInitializer"
android:value="androidx.startup" />
</provider>
</application>
</manifest>
I can launch my app/emulator though but a few features does not work. Do you guys know what's happening? Also when I open AndroidManifest it's normal but when I launch emulator it turns red, if I exit and open again it's back to normal yellow, though there is a red underline under the destination activity problem

update this manifest file with your manifest, and rebuild.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.remindertest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="21"
android:targetSdkVersion="31" />
<application
android:allowBackup="true"
android:appComponentFactory="androidx.core.app.CoreComponentFactory"
android:debuggable="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:testOnly="true"
android:theme="#style/Theme.ReminderTest" >
<activity
android:name="com.example.remindertest.Activity2"
android:exported="false" />
<activity android:name="com.example.remindertest.DestinationActivity" />
<activity
android:name="com.example.remindertest.MainActivity"
android:exported="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.example.remindertest.AlarmReceiver" />
<provider
android:name="androidx.startup.InitializationProvider"
android:authorities="com.example.remindertest.androidx-startup"
android:exported="false" >
<meta-data
android:name="androidx.emoji2.text.EmojiCompatInitializer"
android:value="androidx.startup" />
<meta-data
android:name="androidx.lifecycle.ProcessLifecycleInitializer"
android:value="androidx.startup" />
</provider>
</application>
</manifest>

XML document structures must start and end within the same entity?

What is the problem?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.4" >
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<receiver android:name=".MainActivity"
tools:ignore="IntentFilterExportedReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>
</application>

You need the closing </manifest> tag under the </application>:
(...)
</application>
</manifest>

Close the manifest tag after application tag.
</application></manifest>
android:icon="#drawable/ic_launcher" // check in drawable folder under res whether the default image ic_launcher is present or not. That is the default icon for your application.

You are missing </manifest> on the last line. It's also likely that android:icon="#drawable/ic_launcher" should be changed to android:icon="#mipmap/ic_launcher".
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.4" >
<application
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

changed package name, now AndroidManifest.xml doesn't work

So, I tried to change the package by the following steps I found elsewhere on StackOverflow website:
create a new package
refractor the package to the new package
changing the package line in the form for the AndroidManifest.xml
btw I'm using Eclipse, if that's relevant.
However, I'm getting an error message in the AndroidManifext.xml file:
Parser exception for /GameProj/AndroidManifest.xml: The prefix "com.p.gameproj.Dataid" for attribute "com.p.gameproj.Dataid:name" associated with an element type "activity" is not bound At line 31.
Can someone tell me what the error message means?
Also, here's the AndroidManifest.xml file, if it's relevant:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.p.gameproj"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.p.gameproj.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
com.p.gameproj.Creditsname=".Credits"
android:label="#string/title_activity_credits" >
</activity>
<activity
com.p.gameproj.Dataid:name=".Data"
android:label="#string/title_activity_data" >
</activity>
<activitycom.p.gameproj.CharacterPageandroid:name=".CharacterPage"
android:label="#string/title_activity_character_page" >
</activity>
<activity
com.p.gameproj.StatPageame=".StatPage"
android:label="#string/title_activity_stat_page" >
</activity>
<activitycom.p.gameproj.MapMain android:name=".MapMain"
android:label="#string/title_activity_map_main" >
</activity>
com.p.gameproj.ScreenLocvity
android:name=".ScreenLoc"
android:label="#string/title_activity_screen_loc"com.p.gameproj.BattleScreen/activity>
<activity
android:name=".BattleScreen"
android:label="#string/title_activity_battle_screen" >
</com.p.gameproj.InvScreen
<activity
android:name=".InvScreen"
android:label="#string/title_activity_inv_screen"com.p.gameproj.ShopThing </activity>
<activity
android:name=".ShopThing"
android:label="#string/title_activity_shop_thing" >
</activity>
</application>
</manifest>

Looks like something went wrong during your package name change. Probably a bad find/replace action. There are a several invalid attributes and elements in the AndroidManifest.xml file such as the following:
<activity
com.p.gameproj.Dataid:name=".Data"
android:label="#string/title_activity_data" >
Notice the com.p.gameproj.Dataid:name=".Data". It should be android:name=".Data".
Once you fix all these bad values it should work again.
This should be close
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.p.gameproj"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.p.gameproj.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Credits"
android:label="#string/title_activity_credits" >
</activity>
<activity
android:name=".Data"
android:label="#string/title_activity_data" >
</activity>
<activity
android:name=".CharacterPage"
android:label="#string/title_activity_character_page" >
</activity>
<activity
android:name=".StatPage"
android:label="#string/title_activity_stat_page" >
</activity>
<activity
android:name=".MapMain"
android:label="#string/title_activity_map_main" >
</activity>
<activity
android:name=".ScreenLoc"
android:label="#string/title_activity_screen_loc">
</activity>
<activity
android:name=".BattleScreen"
android:label="#string/title_activity_battle_screen" >
</activity>
<activity
android:name=".InvScreen"
android:label="#string/title_activity_inv_screen">
</activity>
<activity
android:name=".ShopThing"
android:label="#string/title_activity_shop_thing" >
</activity>
</application>
</manifest>

error parsing xml not well-formed (invalid token) in my manifest.xml

Here is my code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.semesterproject"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:windowSoftInputMode="adjustResize|adjustPan"
android:name=".MainActivity"
android:label="#string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
The error is shown at the start of activity tag.
I changed the android:theme in the application to fullscreen then the error was generated, I did undo the changes i-e change the them to the previous theme that is shown in the code but it's still giving the error. What is causing the error, and how can I fix it?

The Icon App dosen't appear in my activities

when I update my SDK the icon app doesn't appear in the activities I tried all the solution on the internet but nothing happened .. I tried also to put " android:icon" in each activities nothing change also made a custom actionbar also nothing change .. please any help?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package=""
android:installLocation="auto"
android:versionCode="1"
android:versionName="1.0" >
"
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/CustomActionBarTheme" >
<activity
android:name=".Main"
android:label="#string/app_name"
android:theme="#style/NoActionBarTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Option"
android:label="#string/title_activity_option" >
</activity>
<activity
android:name=".CustomList"
android:label="#string/title_activity_custom_list" >
</activity>
<activity
android:name=".Social"
android:label="#string/title_activity_social" >
</activity>
<activity
android:name=".About"
android:label="#string/title_activity_about" >
</activity>
<activity
android:name=".ActionBar"
android:label="#string/title_activity_action_bar" >
</activity>
</application>
</manifest>