title: Didn't find class on path: DexPathList?
body: <p>My app  is working fine when I test in real device using USB in android studio.But When I send the apk to another device and install there,it is not working.App get crashed.I did not find any right way to solve the problem.Errors are given below:</p>
  
  <pre><code>FATAL EXCEPTION: main Process: com.w3xplorers.cmch,PID: 17715                                                                           java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.w3xplorers.cmch/com.w3xplorers.cmch.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.w3xplorers.cmch.MainActivity" on path: DexPathList[[zip file "/data/app/com.w3xplorers.cmch-1/base.apk"],nativeLibraryDirectories=[/data/app/com.w3xplorers.cmch-1/lib/arm, /system/lib, /vendor/lib, system/vendor/lib, system/vendor/lib/egl, system/lib/hw]]
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2395)
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2544)
      at android.app.ActivityThread.access$900(ActivityThread.java:150)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1394)
      at android.os.Handler.dispatchMessage(Handler.java:102)
      at android.os.Looper.loop(Looper.java:168)
      at android.app.ActivityThread.main(ActivityThread.java:5845)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:797)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:687)
      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.w3xplorers.cmch.MainActivity" on path: DexPathList[[zip file "/data/app/com.w3xplorers.cmch-1/base.apk"],nativeLibraryDirectories=[/data/app/com.w3xplorers.cmch-1/lib/arm, /system/lib, /vendor/lib, system/vendor/lib, system/vendor/lib/egl, system/lib/hw]]
      at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
      at android.app.Instrumentation.newActivity(Instrumentation.java:1085)
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2385)
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2544) 
      at android.app.ActivityThread.access$900(ActivityThread.java:150) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1394) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:168) 
      at android.app.ActivityThread.main(ActivityThread.java:5845) 
      at java.lang.reflect.Method.invoke(Native Method) 
      atcom.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:687)                                                                         Suppressed: java.lang.ClassNotFoundException: com.w3xplorers.cmch.MainActivity
      at java.lang.Class.classForName(Native Method)
      at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
      at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:504)                                                                                ... 12 more
      Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
  </code></pre>
  
  <p>My Manifests is below:</p>
  
  <pre><code>`&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.w3xplorers.cmch"&gt;
  
  &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
  &lt;uses-permission android:name="android.permission.READ_PHONE_STATE" /&gt;
  &lt;uses-permission android:name="android.permission.READ_CONTACTS" /&gt;
  &lt;uses-permission android:name="android.permission.WRITE_CONTACTS" /&gt;
  &lt;uses-permission android:name="android.permission.SEND_SMS" /&gt;
  
  
  &lt;application
      android:name="com.w3xplorers.cmch.EnableMultiDex"
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme" &gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.MainActivity"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" &gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.HomeActivity"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.QuickSms"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.GroupSms"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.SelfSms"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.Contact"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.Favourite"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity
          android:name="com.w3xplorers.cmch.Info"
          android:screenOrientation="portrait"
          android:theme="@style/AppTheme.NoActionBar" /&gt;
      &lt;activity android:name="com.w3xplorers.cmch.Dialog" /&gt;
  &lt;/application&gt;
  
  &lt;/manifest&gt;`
  </code></pre>
  
  <p>Gradle below:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
  compileSdkVersion 25
  buildToolsVersion "25.0.2"
  defaultConfig {
      applicationId "com.w3xplorers.cmch"
      minSdkVersion 13
      targetSdkVersion 25
      versionCode 1
      versionName "1.0"
      testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      multiDexEnabled true
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
  }
  }
  
  
  dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
  {
      exclude group: 'com.android.support', module: 'support-annotations'
  })
  compile 'com.android.support:appcompat-v7:25.3.0'
  compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha5'
  compile 'com.android.support:design:25.3.0'
  compile 'com.andreabaccega:android-form-edittext:1.0.3'
  compile 'com.android.volley:volley:1.0.0'
  compile 'com.squareup.okhttp3:okhttp:3.3.1'
  compile 'com.android.support:multidex:1.0.1'
  testCompile 'junit:junit:4.12'
  }
  </code></pre>