Google SignIn API Exception 10

接近认证的最后阶段，但方法出了问题。它在日志中返回异常代码 10（开发人员错误）。谷歌提供了全面的描述：handleSignInResult

应用程序配置错误。此错误不可恢复，将被视为致命错误。开发人员是个白痴...

我应该如何处理这个问题（获取帐户）并最终从帐户中检索值？
提前感谢您的帮助!!!

主要活动：

package ru.podgorny.carcall;

import ...

public class MainActivity extends AppCompatActivity {

        SignInButton signInButton;
        public static final int RC_SIGN_IN = 07;
        public static final String TAG = "MainActivity";
        TextView tw1;
        TextView tw2;


        GoogleSignInOptions gso;
        GoogleSignInClient mGSC;


        @Override
        protected void onCreate (Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d(TAG, "Activity Works");
        findViews();

            gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                    .requestEmail()
                    //.requestProfile()
                    .build();

            mGSC = GoogleSignIn.getClient(this, gso); //smth with mGSC variable....

             View.OnClickListener onClickListener = new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onClick2(v);
                }
            };
             signInButton.setOnClickListener(onClickListener);




    }

    private void findViews() {
            Log.d (TAG, "findViews started");
        signInButton = findViewById(R.id.idButtonGoogle);

        tw1 = findViewById(R.id.textView1);
        tw1 = findViewById(R.id.textView2);

        Log.d(TAG, "Views finded");


    }

    public void onClick2(View view) {
            Log.d(TAG, "onClick started");
        switch (view.getId()) {
            case R.id.idButtonGoogle:
                signIn();
                break;
        }
        Log.d(TAG, "OnClick Started");
    }

    public void signIn() {

        Intent signInIntent = mGSC.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
        Log.d(TAG, "startActivityForResult works");

    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.d(TAG, "OnActivityResult started");
        // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            // The Task returned from this call is always completed, no need to attach
            // a listener.
            Log.d(TAG, "TASK started");
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
            Log.d(TAG, "OnActivityResult returned");
        }
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);//ERROR -- Code 10
            Log.d(TAG, "Account received");


            updateUI(account);
            Log.d(TAG, "updateUI Launched");
        } catch (ApiException e) {

            Log.w(TAG, "signInResult:failed code=" + e.getStatusCode());
            updateUI(null);
        }
    }

    private void updateUI(GoogleSignInAccount account) {
            if (account!=null) {
                tw1.setText("OK");
                tw2.setText("Name: " + account.getGivenName() + ", Family name: " + account.getFamilyName() + ", Email: " + account.getEmail() /*+ " image: " +
                        account.getPhotoUrl()*/);
            }else {
                tw1.setText("SMTH wrong");
            }

        }

}