invalid service notification error while uploading image

I am trying to single image. But I get the following error

An uncaught Exception occurred on "main" thread.
android.app.RemoteServiceException: Bad notification for startForeground: java.lang.RuntimeException: invalid service notification: Notification(channel=null pri=0 contentView=null vibrate=null sound=null defaults=0x0 flags=0x42 color=0x00000000 groupKey=net.gotev vis=PRIVATE)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1768)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:164)
	at android.app.ActivityThread.main(ActivityThread.java:6494)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

This is the upload function:

 displayImage(){
        var documents = fs.knownFolders.temp();

        documents.getEntities()
        .then((entities)=>{
            // entities is array with the document's files and folders.
            entities.forEach((entity)=>{
                console.log(entity);
                console.log(entity.path);
                
                let token = appSettings.getString("token");
                console.log(token);
                if (token != ''){

                    var request = {
                        url:  url
                        method: "POST",
                        headers: {
                            "Content-Type": "application/octet-stream",
                            "File-Name": entity.path,
                            "Authorization": "Bearer " + token  
                        },
                        description: "{ 'uploading': 'bigpig.jpg' }"
                    };
                    
                    var task = session.uploadFile(entity.path, request);
                    
                    task.on("progress", this.logEvent);
                    task.on("error", this.logEvent);
                    task.on("complete", this.logEvent);
                    
                   
              }
            });
        }, function (error) {
            // Failed to obtain folder's contents.
            // globalConsole.error(error.message);
        });

the entity path is " /data/user/0/org.testApp.testApp/cache/savedImage1510757546373.jpg". I tried to save the image to the temp folder of the emulator and find the file and upload to the server.

Could anyone tell me what is missing? and what this error means? Any help would be much appreciated. Thanks.

[mariuspruski]

This is still the case with version 3.2.1 when using androidDisplayNotificationProgress: true When setting this property to false, we get a different exception, namely:

JS: ERROR Error: Uncaught (in promise): Error: java.lang.IllegalArgumentException: Android Oreo requires a notification configuration for the service to run. https://developer.android.com/reference/android/content/Context.html#startForegroundService(android.content.Intent)
JS:     net.gotev.uploadservice.UploadRequest.startUpload(UploadRequest.java:72)
JS:     com.tns.Runtime.callJSMethodNative(Native Method)
JS:     com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1088)
JS:     com.tns.Runtime.callJSMethodImpl(Runtime.java:970)

As far as I can see, this library in its newest version ALWAYS needs a notificationConfig, otherwise it will throw this exception.

We will stay on version 3.2.0 with notifications disabled, as this seems to be the only working way on Android Oreo.

[devicrossing]

@mariuspruski thx for your quick reply , updated all modules and still have the same error