AndroidStudioで作成したアプリに表示される「エラーコード：３」の解決

現在、大学の授業でアプリを開発しております。
そのアプリは音声認識とビデオ通話を組み合わせたリアルタイムで音声を文字に変換するアプリです。
二つの機能を実装することは出来たのですが、ビデオ通話を接続すると音声認識が出来なくなり、エラーコード：３と表示されてしまいます。
調べてみたところ、グーグルアプリのダウンロードの際にこのメッセージが表示されているようなのですが、私の開発しているアプリとの関連性が分かりません。
通話の接続をしなければ問題なく音声認識は動いているのでコードのミスではないと思うのですが、
何か解決方法、原因を教えていただけないかと思います。

MainActivity
1public class MainActivity extends AppCompatActivity
2        implements View.OnClickListener, RecognitionListener{
3    private static final String TAG = MainActivity.class.getSimpleName();
4
5    //省略
6    private boolean _bConnected;
7
8    private Handler _handler;
9
10    @Override
11    protected void onCreate(Bundle savedInstanceState) {
12        Window wnd = getWindow();
13        wnd.addFlags(Window.FEATURE_NO_TITLE);
14        super.onCreate(savedInstanceState);
15        setContentView(R.layout.activity_main);
16
17      });
18
19        _handler = new Handler(Looper.getMainLooper());
20        final Activity activity = this;
21
22        _handler = new Handler(Looper.getMainLooper());
23
24     
25        PeerOption option = new PeerOption();
26        option.key = API_KEY;
27        option.domain = DOMAIN;
28        option.debug = Peer.DebugLevelEnum.ALL_LOGS;
29        _peer = new Peer(this, option);
30
31     
32        _peer.on(Peer.PeerEventEnum.OPEN, new OnCallback() {
33            @Override
34            public void onCallback(Object object) {
35                _strOwnId = (String) object;
36                TextView tvOwnId = (TextView) findViewById(R.id.tvOwnId);
37                tvOwnId.setText(_strOwnId);
38       
39                if (ContextCompat.checkSelfPermission(activity,
40                        Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(activity,
41                        Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
42                    ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO}, 0);
43                } else {
44                  
45                    startLocalStream();
46                }
47
48            }
49        });
50        _peer.on(Peer.PeerEventEnum.CALL, new OnCallback() {
51            @Override
52            public void onCallback(Object object) {
53              //省略
54
55                    closeRemoteStream();
56                    _mediaConnection.close(true);
57
58                }
59
60                v.setEnabled(true);
61            }
62        });
63
64
65        Button switchCameraAction = (Button) findViewById(R.id.switchCameraAction);
66        switchCameraAction.setOnClickListener(new View.OnClickListener() {
67            @Override
68            public void onClick(View v) {
69                if (null != _localStream) {
70                    Boolean result = _localStream.switchCamera();
71                    if (true == result) {
72                        
73                    } else {
74                        
75                    }
76                }
77
78            }
79        });
80      
81        mButton = (Button) findViewById(R.id.speech_button);
82        mText = (TextView) findViewById(R.id.output_text);
83
84        mButton.setOnClickListener(this);
85
86        mRecorder = null;
87
88        mAlert = new AlertDialog.Builder(this);
89        mAlert.setTitle("エラー");
90        mAlert.setPositiveButton("OK", null);
91
92        checkRecordable();
93
94    }
95
96    public Boolean checkRecordable() {
97        if (!SpeechRecognizer.isRecognitionAvailable(getApplicationContext())) {
98
99            mText.setText("音声認識が使用できません");
100            return false;
101        }
102        if (Build.VERSION.SDK_INT >= 23) {
103            if (ActivityCompat.checkSelfPermission(this,
104                    Manifest.permission.RECORD_AUDIO)
105                    != PackageManager.PERMISSION_GRANTED) {
106                mText.setText("マイクの使用を許可してください");
107                ActivityCompat.requestPermissions(this,
108                        new String[]{
109                                Manifest.permission.RECORD_AUDIO},
110                        PERMISSION_RECORD_AUDIO);
111                return false;
112            }
113        }
114        return true;
115    }
116
117    @Override
118    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
119        switch (requestCode) {
120           //省略
121                break;
122        }
123    }
124
125    @Override
126    protected void onStart() {
127        super.onStart();
128
129        View decorView = getWindow().getDecorView();
130        decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
131
132        Window wnd = getWindow();
133        wnd.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
134        wnd.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
135    }
136
137    @Override
138    protected void onResume() {
139        super.onResume();
140      /////省略
141        super.onDestroy();
142    }
143
144    void startLocalStream() {
145        Navigator.initialize(_peer);
146        MediaConstraints constraints = new MediaConstraints();
147        _localStream = Navigator.getUserMedia(constraints);
148        Canvas canvas = (Canvas) findViewById(R.id.svLocalView);
149        _localStream.addVideoRenderer(canvas, 0);
150    }
151
152    void setMediaCallbacks() {
153
154        _mediaConnection.on(MediaConnection.MediaEventEnum.STREAM, new OnCallback() {
155            @Override
156            public void onCallback(Object object) {
157                _remoteStream = (MediaStream) object;
158                Canvas canvas = (Canvas) findViewById(R.id.svRemoteView);
159                _remoteStream.addVideoRenderer(canvas, 0);
160            }
161        });
162
163      //省略
164
165        updateActionButtonTitle();
166    }
167
168    void showPeerIDs() {
169        if ((null == _peer) || (null == _strOwnId) || (0 == _strOwnId.length())) {
170           //省略
171 } else {
172                    Toast.makeText(fContext, "PeerID list (other than your ID) is empty.", Toast.LENGTH_SHORT).show();
173                }
174            }
175        });
176
177    }
178    void updateActionButtonTitle() {
179        _handler.post(new Runnable() {
180            @Override
181            public void run() {
182                Button btnAction = (Button) findViewById(R.id.btnAction);
183                if (null != btnAction) {
184                    if (false == _bConnected) {
185                        btnAction.setText("Make Call");
186                    } else {
187                        btnAction.setText("Hang up");
188                    }
189                }
190            }
191        });
192    }
193    public void stopRecording() {
194       //省略
195
196            mButton.setText(getString(R.string.stop_speech));
197        }
198    }
199
200    @Override
201    public void onClick(View v) {
202        if(v.getId() != R.id.speech_button){
203            return;
204        }
205        if(mRecorder != null){
206            stopRecording();
207        }
208        else{
209            startRecording();
210        }
211    }
212
213    @Override
214    public void onReadyForSpeech(Bundle params) {
215        Log.d("MainActivity","onReadyForSpeech");
216        mText.setText(getString(R.string.ready_speech));
217    }
218
219    @Override
220    public void onBeginningOfSpeech() {
221        Log.d("MainActivity","onBeginningOfSpeech");
222        mText.setText("");
223    }
224
225    @Override
226    public void onBufferReceived(byte[] buffer) {
227        Log.d("MainActivity","onBufferReceived");
228    }
229
230    @Override
231    public void onRmsChanged(float rmsdB) {
232        Log.d("MainActivity","onRmsChanged");
233    }
234
235    @Override
236    public void onEndOfSpeech() {
237        Log.d("MainActivity","onEndOfSpeech");
238        stopRecording();
239    }
240
241    @Override
242    public void onError(int error) {
243        Log.d("MainActivity","onError.error="+error);
244        mText.setText(getString(R.string.speech_error) + "\nエラーコード：" + error);
245        stopRecording();
246    }
247
248    @Override
249    public void onEvent(int eventType, Bundle params) {
250        Log.d("MainActivity","onEvent.eventType="+eventType);
251    }
252
253    @Override
254    public void onPartialResults(Bundle partialResults) {
255        Log.d("MainActivity","onPartialResults");
256        String str = partialResults.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION).get(0);
257        if(str.length() > 0) {
258            mText.setText(str);
259        }
260    }
261
262    @Override
263    public void onResults(Bundle results) {
264        Log.d("MainActivity","onResults");
265    }
266
267}