dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.google.firebase:firebase-core:10.2.0'
implementation 'com.google.firebase:firebase-database:10.2.0'
implementation 'com.rengwuxian.materialedittext:library:2.1.4'
implementation 'com.android.support:cardview-v7:27.+'
implementation 'com.android.support:design:27.+'
implementation 'com.android.support:appcompat-v7:27.+'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
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.google.firebase:firebase-core:16.0.0'

super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    database = FirebaseDatabase.getInstance();
    users = database.getReference("Users");

    edtUser=(MaterialEditText)findViewById(R.id.edtUser);
    edtPassword=(MaterialEditText)findViewById(R.id.edtPassword);

java.lang.NoSuchMethodError: No virtual method zzUU()Z in class Lcom/google/firebase/FirebaseApp; or its super classes (declaration of 'com.google.firebase.FirebaseApp' appears in /data/app/com.example.cagri.kpssgenelkltrtesti-2/split_lib_dependencies_apk.apk)
    at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
    at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
    at com.example.cagri.kpssgenelkltrtesti.MainActivity.onCreate(MainActivity.java:35)
    at android.app.Activity.performCreate(Activity.java:6237)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at