Intellij IDEA - Too many errors on the project creation

Hello. I want to study and learn how to create Android apps using the Kotlin language. For this, I decided to use the IntelliJ IDEA platform. However, I am having a lot of difficulties before I even start my studies.

I installed Intellij IEA in the "ideaIC-2019.2.3" version on a newly installed Windows 10 Pro x64 computer as it was formatted for Intellij IDEA installation.

The installation was done without any problem. After that, when trying to create my first project, the program downloaded and installed a series of SDK file packages, which happened without any problems.

After installing the SDK, the program created my first project and in its tabs it opened two files for me: ACTIVITY_MAIN.XML and MAINACTIVITY.KT. Both open files already have some code created automatically by the program.

However, from the beginning, the program points out some errors in the code that it itself generated when it created the project. Below I will leave you the code automatically generated for each of the files and highlight in bold letters the errors pointed out in each line of programming:

ACTIVITY_MAIN.XML
------------------------------

<? xml version = "1.0" encoding = "utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        xmlns: android = "http://schemas.android.com/apk/res/android"     --> Resource registered by this uri is not recognized  (Settings | Languages and frameworks | Schemas and DTDs)
        xmlns: tools = "http://schemas.android.com/tools"     --> URl is not registered   (Settings | Languages and frameworks | Schemas and DTDs)
        xmlns: app = "http://schemas.android.com/apk/res-auto"     --> URl is not registered   (Settings | Languages and frameworks | Schemas and DTDs)
        android: layout_width = "match_parent"     --> Attribute android:layout_width is not allowed here
        android: layout_height = "match_parent"     --> Attribute android:layout_height is not allowed here
        tools: context = ". MainActivity">     --> Attribute tools:context is not allowed here

    <TextView --> Element TextView is not allowed here
            android: layout_width = "wrap_content"
            android: layout_height = "wrap_content"
            android: text = "Hello World!"
            app: layout_constraintBottom_toBottomOf = "parent"
            app: layout_constraintLeft_toLeftOf = "parent"
            app: layout_constraintRight_toRightOf = "parent"
            app: layout_constraintTop_toTopOf = "parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

MAINACTIVITY.KT (It file don't have any errors)
--------------------------

package br.com.regionalissimo.helloworld

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

 

When trying to work around these errors, I came across some people who suggested making some modifications to a file called ANDROIDMANIFEST.XML, which would probably make these errors that appear in the ACTIVITY_MAIN.XML file go away.

However, when opening this other file, I noticed that it is also full of errors as follows:

 

 

ANDROIDMANIFEST.XML

------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"     --> Resource registered by this uri is not recognized  (Settings | Languages and frameworks | Schemas and DTDs)
          package="br.com.regionalissimo.helloworld">

    <application
            android:allowBackup="true"     --> Attribute android:layout_height is not allowed here
            android:icon="@mipmap/ic_launcher"     --> Attribute android:icon is not allowed here
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"     --> Attribute  android:roundIcon is not allowed here
            android:supportsRtl="true"     --> Attribute android:supportsRtl is not allowed here
            android:theme="@style/AppTheme">     --> Attribute android:theme is not allowed here
        <activity android:name=".MainActivity">     --> Unresolved class 'MainActivity' more... (Ctrl + F1)
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>

It's been two days that I've been trying to solve this problem and I can't. I have installed and dismantled the program several times, even formatted the computer twice, but these errors persist in tormenting me and preventing me from studying, according to my goal.

I count on the help of you who already have experience with this program to guide me in the solution of this program. Brazilian greetings. Thanks.

(PS: Sorry for my bad English, I hope you understand me)