Error while merging dex archive in Android Studio (Android forum at Coderanch)

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Hi.

I'm making an QR code Scanner using ZXing in my library. I'm getting this error while trying to to run this program in my phone via app debugging:

AGPBI: {"kind":"error","text":"Program type already present: android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat","sources":[{}],"tool":"D8"}

:app:transformDexArchiveWithExternalLibsDexMergerForDebug FAILED

Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives

here is my app build:gradle :

apply plugin: 'com.android.application'
android {
   compileSdkVersion 28
   defaultConfig {
       multiDexEnabled true
       applicationId "com.example.toshiba.myekantin"
       minSdkVersion 14
       targetSdkVersion 22
       versionCode 1
       versionName "1.0"
       testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
   buildTypes {
       release {
           minifyEnabled false
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
   productFlavors {
dependencies {
   implementation fileTree(include: ['*.jar'], dir: 'libs')
   //noinspection GradleCompatible
   implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
   implementation 'com.android.support.constraint:constraint-layout:1.1.1'
   testImplementation 'junit:junit:4.12'
   androidTestImplementation 'com.android.support.test:runner:1.0.2'
   androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
   implementation 'com.journeyapps:zxing-android-embedded:3.4.0'
   implementation 'com.android.support:multidex:1.0.3'
}

and this is my main_activity :

package com.example.toshiba.myekantin;

import android.content.Context;
import android.content.Intent;
import android.support.multidex.MultiDex;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
   //View Objects
   private Button button_send;
   private EditText text_send;
   private IntentIntegrator qrScan;
   protected void attachBaseContext(Context base) {
       super.attachBaseContext(base);
       MultiDex.install(this);
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       button_send = (Button) findViewById(R.id.button_send);
       text_send = (EditText) findViewById(R.id.text_send);
       button_send.setOnClickListener(this);
       qrScan = new IntentIntegrator(this);
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
       if (result != null) {
           //if qrcode has nothing in it
           if (result.getContents() == null) {
               Toast.makeText(this, "Result Not Found", Toast.LENGTH_LONG).show();
           } else {
               //if qr contains data
               try {
                   //converting the data to json
                   JSONObject obj = new JSONObject(result.getContents());
                   //setting values to textviews
                   text_send.setText(obj.getString("name"));
               } catch (JSONException e) {
                   e.printStackTrace();
                   //if control comes here
                   //that means the encoded format not matches
                   //in this case you can display whatever data is available on the qrcode
                   //to a toast
                   Toast.makeText(this, result.getContents(), Toast.LENGTH_LONG).show();
       } else {
           super.onActivityResult(requestCode, resultCode, data);
   @Override
   public void onClick(View view) {
       //initiating the qr code scan
       qrScan.initiateScan();
}

I'm using :
Android Studio 3.1.3
API 22

What have i try to get rid the error :

clean project and rebuild project

adding this to my main activity program

protected void attachBaseContext(Context base) {
       super.attachBaseContext(base);
       MultiDex.install(this);
<span class="postbody ">I do have a couple of thoughts which may help.
<br/> <li>Some postings suggest that this problem can be related to outdated libraries.
<br/>    - Do you know if you have the more recent SDK and recent versions of all of the libraries that your app wants?</li><li>What if you try an different (newer or older) version of Gradle?</li><li>What if you try an older version of Android Studio?</li><li>Some postings suggest that this problem is related to certain libraries.
<br/>    - Are you able to create a slimmed down version of your app with only the Barcode library?</li><li>Does changing the SDK versions either compile, min or target give you different results?</li><li>A posting or two suggest that the cause shown in this line
<br/>    <tt>AGPBI: {"kind":"error","text":"Program type already present: android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat","sources":[{}],"tool":"D8"}.</tt>
<br/>    Or more precisely with the <i>android.support.v4 library</i>. If you change to different (older or newer) of that library do you get different results?</li><li>You appear to be using an "alpha" version of a library, this could be an issue</li></span>
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