I am converting existing GCM to Firebase Messaging in my project but I am getting this error, Can you help me? Thanks in Advance : 12-23 11:27:22.729 4443-4443/com.example.tabswithswipe E/AndroidRuntime: FATAL EXCEPTION: main
                                                                         java.lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/com.example.tabswithswipe-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.tabswithswipe-2, /vendor/lib, /system/lib]]
                                                                             at android.app.ActivityThread.installProvider(ActivityThread.java:5100)
                                                                             at android.app.ActivityThread.installContentProviders(ActivityThread.java:4680)
                                                                             at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4613)
                                                                             at android.app.ActivityThread.access$1300(ActivityThread.java:162)
                                                                             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1424)
                                                                             at android.os.Handler.dispatchMessage(Handler.java:107)
                                                                             at android.os.Looper.loop(Looper.java:194)
                                                                             at android.app.ActivityThread.main(ActivityThread.java:5371)
                                                                             at java.lang.reflect.Method.invokeNative(Native Method)
                                                                             at java.lang.reflect.Method.invoke(Method.java:525)
                                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
                                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
                                                                             at dalvik.system.NativeStart.main(Native Method)
                                                                          Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.firebase.provider.FirebaseInitProvider" on path: DexPathList[[zip file "/data/app/com.example.tabswithswipe-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.tabswithswipe-2, /vendor/lib, /system/lib]]
                                                                             at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
                                                                             at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
                                                                             at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
                                                                             at android.app.ActivityThread.installProvider(ActivityThread.java:5085)
                                                                             at android.app.ActivityThread.installContentProviders(ActivityThread.java:4680) 
                                                                             at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4613) 
                                                                             at android.app.ActivityThread.access$1300(ActivityThread.java:162) 
                                                                             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1424) 
                                                                             at android.os.Handler.dispatchMessage(Handler.java:107) 
                                                                             at android.os.Looper.loop(Looper.java:194) 
                                                                             at android.app.ActivityThread.main(ActivityThread.java:5371) 
                                                                             at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                             at java.lang.reflect.Method.invoke(Method.java:525) 
                                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833) 
                                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
                                                                             at dalvik.system.NativeStart.main(Native Method) 
