java - "Unfortunately app has stopped working " Android Studio

Please i am trying to change my launcher Activity to an authentication Activity i just developed using twitter digits, i already made the necessary adjustment in my android manifest and java code but noticed that the app keeps crashing each time i attempt to launch,the name of the authentication Activity is AboutAcivity.java, during the debugging session, i observed from my android monitor console that this line highlighted in blue at com.close.close.AboutActivity.onCreate(AboutActivity.java:34)

always point to setContentView(R.layout.activity_about); i have inspected that layout and find nothing wrong, i guess i need a third eye to help crush this annoying bug, Note, i already reviewed other staackoverflow questions but the solution there did not work for me. Thank you.

here is my manifest:

          package="com.close.close"
          android:versionCode="1"
          android:versionName="1.0">

            android:minSdkVersion="16"
        android:targetSdkVersion="19"/>


    
    
    
    
    
            android:name="android.permission.CAMERA"
        android:required="true"/>


    

    
    

            android:allowBackup="true"
        android:icon="@drawable/app_icon"
        android:label="@string/app_name"
        android:theme="@style/CustomActionBarTheme">

                    android:name=".MessageService"
            android:enabled="true"/>

                    android:name=".AboutActivity"
            android:label="@string/app_name">
            
                


                
            
        
        
                    android:name="io.fabric.ApiKey"
            android:value="34308698bb3cbc96444f2ff10ad1ae167d75d8e9"/>

        
        

        
        



                    android:name=".ChatActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_chat"
            android:launchMode="singleTop">

        
                    android:name=".ViewImageActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_view_image"
            android:parentActivityName=".ChatActivity"
            android:theme="@style/FullscreenTheme">
        
                    android:name=".RecordAudioActivity"

            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_record_audio"
            android:parentActivityName=".ChatActivity">
        
                    android:name=".PlayVideoActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_play_video">
        
        
            android:name=".FilePickerActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_file_picker"
            android:parentActivityName=".ChatActivity">
        
                    android:name=".WebViewActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/title_activity_web_view"
            android:parentActivityName=".ChatActivity">

            
                

                
                

                
            
        
        
            android:name=".DrawingActivity"
            android:label="@string/title_activity_drawing">
        

    

Here is the AboutActivity code

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

import com.digits.sdk.android.AuthCallback;
import com.digits.sdk.android.Digits;

import com.digits.sdk.android.DigitsAuthButton;
import com.digits.sdk.android.DigitsException;
import com.digits.sdk.android.DigitsSession;
import com.twitter.sdk.android.core.TwitterAuthConfig;
import com.twitter.sdk.android.core.TwitterCore;

import io.fabric.sdk.android.Fabric;

public class AboutActivity extends AppCompatActivity {







    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TwitterAuthConfig authConfig = new TwitterAuthConfig(TWITTER_KEY, TWITTER_SECRET);
        Fabric.with(this, new TwitterCore(authConfig), new Digits.Builder().build());

        setContentView(R.layout.activity_about);





        DigitsAuthButton digitsButton = (DigitsAuthButton) findViewById(R.id.auth_button);

        digitsButton.setCallback(new AuthCallback() {
            @Override

            public void success(DigitsSession session, String phoneNumber) {
                // TODO: associate the session userID with your user model
                Toast.makeText(getApplicationContext(), "Authentication successful for "
                        + phoneNumber, Toast.LENGTH_LONG).show();

                Intent intent=new Intent(AboutActivity.this,Profile_info.class); // redirecting to LoginActivity.
                startActivity(intent);

            }


            @Override
            public void failure(DigitsException exception) {
                Log.d("Digits", "Sign in with Digits failure", exception);
            }
        });



    }
}

Here is my log cat

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.close.close/com.close.close.AboutActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2348)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2410)
                      at android.app.ActivityThread.access$800(ActivityThread.java:151)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1313)
                      at android.os.Handler.dispatchMessage(Handler.java:102)

                      at android.os.Looper.loop(Looper.java:135)
                      at android.app.ActivityThread.main(ActivityThread.java:5348)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:372)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742)
                   Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
                      at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:359)
                      at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:328)
                      at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)

                      at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
                      at com.close.close.AboutActivity.onCreate(AboutActivity.java:34)
                      at android.app.Activity.performCreate(Activity.java:6012)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2410) 
                      at android.app.ActivityThread.access$800(ActivityThread.java:151) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1313) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:135) 

                      at android.app.ActivityThread.main(ActivityThread.java:5348) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:372) 

Here is my activity_about.xml

                xmlns:tools="http://schemas.android.com/tools"

                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="#FD579D"
                android:paddingBottom="@dimen/activity_vertical_margin"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                tools:context="com.close.close.AboutActivity"
                android:orientation="horizontal">



            android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="28dp"
        android:gravity="center_horizontal"
        android:text="@string/welcome"
        android:textColor="#FFFFFF"

        android:textSize="37sp"/>

            android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="80dp"
        android:gravity="center_horizontal"
        android:text="@string/to"

        android:textColor="#FFFFFF"
        android:textSize="37sp"/>

            android:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="128dp"
        android:gravity="center_horizontal"

        android:text="@string/close"
        android:textColor="#FFFFFF"
        android:textSize="37sp"/>
            android:id="@+id/textView4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="189dp"
        android:gravity="center_horizontal"

        android:text="@string/about"
        android:textColor="#FFFFFF"
        android:textSize="18sp"/>

            android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingTop="50dp"
        android:weightSum="1"

        android:layout_marginStart="164dp"
        android:layout_below="@+id/textView4"
        android:layout_alignParentStart="true">


    


            android:id="@+id/auth_button"

        android:layout_width="148dp"
        android:layout_height="48dp"
        android:background="@drawable/dgts__digits_btn"
        android:orientation="vertical"
        android:layout_marginTop="54dp"
        android:layout_below="@+id/textView4"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"/>

Answer

Change this

public class AboutActivity extends AppCompatActivity {

to this

public class AboutActivity extends Activity {