I want to start front camer.
This is code in Gradle module

// CameraX core library using the camera2 implementation
def camerax_version = "1.0.0"
// The following line is optional, as the core library is included
indirectly by camera-camera2
implementation "androidx.camera:camera-core:${camerax_version}"
implementation "androidx.camera:camera-camera2:${camerax_version}"
// If you want to additionally use the CameraX Lifecycle library
implementation "androidx.camera:camera-lifecycle:${camerax_version}"
// If you want to additionally use the CameraX View class
implementation "androidx.camera:camera-view:1.0.0-alpha26"
// If you want to additionally use the CameraX Extensions library
implementation "androidx.camera:camera-extensions:1.0.0-alpha26"

and this function to start Camera

public fun startCamera() {
cameraExecutor = Executors.newSingleThreadExecutor()

val cameraProviderFuture = ProcessCameraProvider.getInstance(this)

cameraProviderFuture.addListener({
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()

// Preview
val preview = Preview.Builder()
.build()
.also {
it.setSurfaceProvider(viewFinder.surfaceProvider)
}

imageCapture = ImageCapture.Builder()
.build()

// Select back camera as a default
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA

try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()

// Bind use cases to camera
cameraProvider.bindToLifecycle(this, cameraSelector, preview,
imageCapture)
} catch(exc: Exception) {

showSnackbar(resources.getString(R.string.use_case_binding_failed),
fontTextSize, Snackbar.LENGTH_LONG,
numberRow = 2)
}
}, ContextCompat.getMainExecutor(this))
}

when is CameraSelector.DEFAULT_BACK_CAMERA it works but when i try set val

cameraSelector = CameraSelector.DEFAULT_FRONT_CAMERA

it show errors

I/Camera2CameraInfo: Device Level: INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED
D/CameraValidator: Verifying camera lens facing on generic_x86_arm,
lensFacingInteger: null
E/CameraValidator: Camera LensFacing verification failed, existing
cameras: [Camera@2d3d31e[id=0]]
W/CameraX: Retry init. Start time 15086671 current time 15088624
androidx.camera.core.impl.CameraValidator$CameraIdListIncorrectException:
Expected camera missing from device.
at
androidx.camera.core.impl.CameraValidator.validateCameras(CameraValidator.java:95)
at
androidx.camera.core.CameraX.lambda$initAndRetryRecursively$9$CameraX(CameraX.java:613)
at
androidx.camera.core.-$$Lambda$CameraX$u-Xx2b6YXY5GXNXRh-mDiDnHdpQ.run(Unknown
Source:10)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:923)
Caused by: java.lang.IllegalArgumentException: No available camera
can be found.
at
androidx.camera.core.CameraSelector.filter(CameraSelector.java:105)
at
androidx.camera.core.CameraSelector.filter(CameraSelector.java:135)
at
androidx.camera.core.CameraSelector.select(CameraSelector.java:75)
at
androidx.camera.core.impl.CameraValidator.validateCameras(CameraValidator.java:89)
at
androidx.camera.core.CameraX.lambda$initAndRetryRecursively$9$CameraX(CameraX.java:613)

at
androidx.camera.core.-$$Lambda$CameraX$u-Xx2b6YXY5GXNXRh-mDiDnHdpQ.run(Unknown
Source:10)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)

at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)

at java.lang.Thread.run(Thread.java:923)

how to open front camera ?