title: Make sure to call FirebaseApp.initializeApp(Context) first. Default FirebaseApp is not initialized in this process com.example.login
body: <p>I am making a Firebase Authentication Signup Page using kotlin and there is a run time error while I am running the app. 
  Please See the 3rd and 14th line I can't figure out what is the problem.</p>
  
  <p>I didnt attach the main code please inform me if the codes are necessary to attach.</p>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: main
      Process: com.example.login, PID: 7505
      java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.login/com.example.login.Register}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.login. Make sure to call FirebaseApp.initializeApp(Context) first.
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2567)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
          at android.app.ActivityThread.-wrap12(ActivityThread.java)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
          at android.os.Handler.dispatchMessage(Handler.java:102)
          at android.os.Looper.loop(Looper.java:154)
          at android.app.ActivityThread.main(ActivityThread.java:6119)
          at java.lang.reflect.Method.invoke(Native Method)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
       Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.login. Make sure to call FirebaseApp.initializeApp(Context) first.
          at com.google.firebase.FirebaseApp.getInstance(SourceFile:218)
          at com.google.firebase.auth.FirebaseAuth.getInstance(Unknown Source)
          at com.example.login.Register.&lt;init&gt;(Register.kt:15)
          at java.lang.Class.newInstance(Native Method)
          at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2557)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
          at android.app.ActivityThread.-wrap12(ActivityThread.java) 
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
          at android.os.Handler.dispatchMessage(Handler.java:102) 
          at android.os.Looper.loop(Looper.java:154) 
          at android.app.ActivityThread.main(ActivityThread.java:6119) 
          at java.lang.reflect.Method.invoke(Native Method) 
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
  Application terminated.
  </code></pre>
  
  <p>Implementation</p>
  
  <pre><code>dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      implementation 'com.google.firebase:firebase-auth:16.0.3'
      implementation 'com.google.firebase:firebase-database:16.0.1'
      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'
  }
  </code></pre>