java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter exception

[mohanbright]

java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter exception at com.zoptal.drivilldriver.Utilities.AppService$subscribe$1.onFailure(Unknown Source:7) at org.eclipse.paho.android.service.MqttTokenAndroid.notifyFailure(MqttTokenAndroid.java:146) at org.eclipse.paho.android.service.MqttAndroidClient.simpleAction(MqttAndroidClient.java:1501) at org.eclipse.paho.android.service.MqttAndroidClient.subscribeAction(MqttAndroidClient.java:1526) at org.eclipse.paho.android.service.MqttAndroidClient.onReceive(MqttAndroidClient.java:1377) at androidx.localbroadcastmanager.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:313) at androidx.localbroadcastmanager.content.LocalBroadcastManager$1.handleMessage(LocalBroadcastManager.java:121) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

getting this error while subscibing to a topic

this is how I am subscribing-

mqttAndroidClient!!.subscribe(topic, qos, null, object : IMqttActionListener {
                override fun onSuccess(asyncActionToken: IMqttToken) {
                    // Give your callback on Subscription here

                    // Give your callback on Subscription here
                    Log.d("Subscribe", "Success $topic")
                }
                override fun onFailure(
                        asyncActionToken: IMqttToken,
                        exception: Throwable
                ) {
                    // Give your subscription failure callback here

                    // Give your subscription failure callback here
                    Log.d("Subscribe", "FAILED $topic "+exception.localizedMessage)
                }
            })