Camera view is black, no video preview and no faces are detected

[Zaniyar]

I am using FotoApparat in my App.
When I try to implement the facedetector the Camera View stays black. Nothing to see.

app/build.gradle:

    implementation 'io.fotoapparat:facedetector:1.0.0'
    implementation 'io.fotoapparat:fotoapparat:2.7.0'

MainActivity.kt:

    override fun onCreate(savedInstanceState: Bundle?) {
            ...
        createFotoapparat()
           ...
     }

    private fun createFotoapparat(){
        val cameraView = findViewById<CameraView>(R.id.cameraView)
        fotoapparat = Fotoapparat(
            context = this,
            view = cameraView,
            scaleType = ScaleType.CenterCrop,
            lensPosition = back(),
            logger = loggers(
                logcat()
            ),
            cameraErrorCallback = { error ->
                println("Recorder errors: $error")
            }
        ) 
        // now the processor - when I delete this and also the layouts in the view, Camera preview is visible again
        val processor = FaceDetectorProcessor.with(this)
            .listener({ faces ->
                rectanglesView.setRectangles(faces)  // (Optional) Show detected faces on the view.
                Log.v("Faces",faces.toString());   // is never called!
                // ... or do whatever you want with the result
            })
            .build()

        Fotoapparat.with(this)
            .into(cameraView)
            // the rest of configuration
            .frameProcessor(processor)
            .build()

    }

activity_main.xml:

    <io.fotoapparat.facedetector.view.CameraOverlayLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        <!-- Adjust parameters as you like. But cameraView has to be inside CameraOverlayLayout -->
        <io.fotoapparat.view.CameraView
                android:id="@+id/cameraView"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

        <!-- This view will display detected faces -->
        <io.fotoapparat.facedetector.view.RectanglesView
                android:id="@+id/rectanglesView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:rectanglesColor="@color/colorAccent"
                app:rectanglesStrokeWidth="2dp"/>

    </io.fotoapparat.facedetector.view.CameraOverlayLayout>

I don't get any errors, but I don't see anything. No faces, no camera preview stream.

...

When I add this line, I get the error (I am not sure if this is needed, when I already io.fotoapparat:fotoapparat:2.7.0) :

ERROR: Failed to resolve: io.fotoapparat.fotoapparat:library:1.0.0

for:

    // If you are using Fotoapparat add this one as well
    implementation 'io.fotoapparat.fotoapparat:library:1.2.0' // or later version 

Any ideas?