Firebaseauth nullpointexception

Question

  

我解决了这个问题，这个错误是因为genymotion。如果你   拿这个错误，你应该使用android默认模拟器

 classpath 'com.google.gms:google-services:3.1.1'
 compile 'com.google.firebase:firebase-auth:11.6.2'

这一行返回给我nullpointexception。我该如何解决？;

private FirebaseAuth mauth = FirebaseAuth.getInstance();
mauth.createUserWithEmailAndPassword(email,sifre).addOnCompleteListener(this,new OnCompleteListener<AuthResult>() {
    @Override
    public void onComplete(@NonNull Task<AuthResult> task) {
        if(task.isSuccessful())
        {
            Intent anaekran = new Intent(UyeOl.this,AnaEkran.class);
            startActivity(anaekran);
            finish();
        }
        else
        {
            Toast.makeText(UyeOl.this,"Tekrar deneyein",Toast.LENGTH_SHORT).show();
        }
        loading.dismiss();
    }
});

除外;

  

显示java.lang.NullPointerException                                                        在com.google.android.gms.internal.zzdtp.zzb（未知来源）                                                        在com.google.android.gms.internal.zzdtw.zza（未知来源）                                                        在com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword（未知）   资源）                                                        at anonimchat.UyeOl.RegisterAccount（UyeOl.java:64）                                                        在anonimchat.UyeOl.access $ 300（UyeOl.java:22）                                                        在anonimchat.UyeOl $ 1.onClick（UyeOl.java:48）                                                        在android.view.View.performClick（View.java:4438）                                                        在android.view.View $ PerformClick.run（View.java:18422）                                                        在android.os.Handler.handleCallback（Handler.java:733）                                                        在android.os.Handler.dispatchMessage（Handler.java:95）                                                        在android.os.Looper.loop（Looper.java:136）                                                        在android.app.ActivityThread.main（ActivityThread.java:5001）                                                        at java.lang.reflect.Method.invokeNative（Native Method）                                                        在java.lang.reflect.Method.invoke（Method.java:515）                                                        在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785）                                                        在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）                                                        在dalvik.system.NativeStart.main（本地方法）