Android - 无法设置连接

Question

这是我在构建应用时遇到的错误

  

java.lang.NullPointerException：使用null PendingIntent调用cancel（）           在android.app.AlarmManager.cancel（AlarmManager.java:901）           在org.eclipse.paho.android.service.AlarmPingSender.stop（AlarmPingSender.java:86）           在org.eclipse.paho.client.mqttv3.internal.ClientComms.shutdownConnection（ClientComms.java:327）           在org.eclipse.paho.client.mqttv3.internal.ClientComms $ ConnectBG.run（ClientComms.java:608）           在java.lang.Thread.run（Thread.java:764）

发出此错误的部分代码是

try {
                    client = new MqttAndroidClient(getApplicationContext(), "ssl://192.168.43.112:1883", clientId);
                    InputStream input = getApplicationContext().getResources().openRawResource(R.raw.mynewkeystore);
                    options = new MqttConnectOptions();
                    options.setSocketFactory(client.getSSLSocketFactory(input,"password"));
                    IMqttToken token = client.connect(options);
                    token.setActionCallback(new IMqttActionListener() {
                        @Override
                        public void onSuccess(IMqttToken asyncActionToken) {
                            //Log.d("Connection", "Connected to Broker ");
                            //Toast.makeText(getApplicationContext(),"ConnectiontoMQTTBrokerMade", Toast.LENGTH_SHORT).show();
                            pubConnect.setVisibility(View.INVISIBLE);
                            pubDisconnect.setVisibility(View.VISIBLE);
                            pubPub.setVisibility(View.VISIBLE);
                            ipinputpublish.setVisibility(View.INVISIBLE);
                            messagemqtt.setVisibility(View.VISIBLE);
                        }

                        @Override
                        public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                           // Toast.makeText(getApplicationContext(),"ConnectiontoMQTTBrokerRejected", Toast.LENGTH_SHORT).show();
                            Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
                            Log.d("Connection", "Unable to connect to Broker");
                        }
                    });
                } catch (Exception e) {
                    e.printStackTrace();
                    Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
                }

我无法弄清楚为什么会产生这个错误。有人可以帮帮我吗？