title: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamic.zzf" on path: DexPathList
body: <p>I'm getting this strange error </p>
  
  <blockquote>
    <p>Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamic.zzf" on path: DexPathList[[zip file "/data/app/com.dancam.chords-2/base.apk"],nativeLibraryDirectories=[/data/app/com.dancam.chords-2/lib/arm64, /system/lib64, /vendor/lib64]]
                                                                           at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
                                                                           at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
                                                                           at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
                                                                           at com.google.android.gms.internal.zzel.(Unknown Source) 
                                                                           at com.google.android.gms.internal.zzel.(Unknown Source) 
                                                                           at com.google.android.gms.internal.zzel.zzeU(Unknown Source) 
                                                                           at com.google.android.gms.internal.zzfh.zza(Unknown Source) 
                                                                           at com.google.android.gms.ads.MobileAds.initialize(Unknown Source) 
                                                                           at com.google.android.gms.ads.MobileAds.initialize(Unknown Source) 
                                                                           at dancam.com.chords.Drawer.onCreate(Drawer.java:105) 
                                                                           at android.app.Activity.performCreate(Activity.java:6684) 
                                                                           at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
                                                                           at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2637) 
                                                                           at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2751) 
                                                                           at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1496) 
                                                                           at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                           at android.os.Looper.loop(Looper.java:154) 
                                                                           at android.app.ActivityThread.main(ActivityThread.java:6186) 
                                                                           at java.lang.reflect.Method.invoke(Native Method) 
                                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 
                                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) </p>
  </blockquote>
  
  <p>at Drawer, line 105</p>
  
  <pre><code>MobileAds.initialize(getApplicationContext(), "ca-app-pub-nnnnnnnnnnnnnnnnnnnnnnn");
  </code></pre>
  
  <p>It's the first time I see this error and searching on Google I couldn't even find people talking about it. </p>
  
  <p>Does any of you know why this happens and how to fix it?</p>
  
  <p><strong>MORE INFO:</strong></p>
  
  <p>After implemented the library I had to modify my <code>build.gradle</code> and add</p>
  
  <pre><code>defaultConfig {
   ...
   multiDexEnabled true
  }
  
  dataBinding {
   enabled = true
  }
  </code></pre>
  
  <p><strong>can this changes have something to do with the error?</strong></p>