public void signUpUser(View view){

    EditText mailEditText = (EditText) findViewById(R.id.editText);
    EditText pwdEditTet = (EditText) findViewById(R.id.editText2);


    String email = mailEditText.getText().toString();
    String password = pwdEditTet.getText().toString();

    Log.d("Info",email);
    Log.d("Info",password);

    mAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            try {
                AuthResult result = task.getResult();

                Log.d("Sign up", "createUserWithEmail:onComplete:" + task.isSuccessful());


                // If sign in fails, display a message to the user. If sign in succeeds
                // the auth state listener will be notified and logic to handle the
                // signed in user can be handled in the listener.
                if (!task.isSuccessful()) {
                    Toast.makeText(MainActivity.this, R.string.auth_failed,
                            Toast.LENGTH_SHORT).show();
                }else{
                    Log.d("Sign up", "Sending verification email");
                    // Sending the verification email
                    //FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

                    mAuth.getCurrentUser().sendEmailVerification()
                            .addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {
                                    if (task.isSuccessful()) {
                                        Log.d("Email Sent", "Verification Email sent.");
                                    }else{
                                        Log.d("Email Sent",task.getException().getLocalizedMessage());
                                    }
                                }
                            });
                }
            } catch (Exception e){
                Toast.makeText(MainActivity.this,R.string.user_exist,Toast.LENGTH_SHORT).show();
                Log.e("Exception",e.getLocalizedMessage());
            }
        }
    });
}

10-11 10:10:50.372 31518-31518/au.com.savedme D/Sign up: Sending verification email
10-11 10:10:51.438 31518-31518/au.com.savedme D/Email Sent: An internal error has occurred. [ USER_NOT_FOUND ]
10-11 10:11:00.429 31518-31538/au.com.savedme W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.