[SOLVED] Cognex Barcode SDK not scanning codes

I have implemented Cognex cmbSDK completely in my app. And i'm using trial version. Key and everything is implemented correctly, When i click on button it opens camera and also displays the features but it is not scanning any type of code. Can you please help me why it is not working?

Here is my code:

open class MainActivity : AppCompatActivity(),
ReaderDevice.OnConnectionCompletedListener, ReaderDevice.ReaderDeviceListener,ActivityCompat.OnRequestPermissionsResultCallback{

private val permissionCode = 123
private val sdkKey: String = "My KEY"
private lateinit var readerDevice: ReaderDevice

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    readerDevice = ReaderDevice.getPhoneCameraDevice(this, CameraMode.NO_AIMER,
        PreviewOption.NO_ZOOM_BUTTON, null, sdkKey)
    readerDevice.setReaderDeviceListener(this)
    readerDevice.enableImage(true)
    readerDevice.enableImageGraphics(false)
    readerDevice.connect(this)
    enableSymbologies()

    btnScanBarcode.setOnClickListener{
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
            == PackageManager.PERMISSION_DENIED){
            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA), permissionCode)
        }
        readerDevice.startScanning()
    }
}

override fun onConnectionCompleted(readerDevice: ReaderDevice?, error: Throwable?) {
    Toast.makeText(this, "Connection Created", Toast.LENGTH_LONG).show()
    if (error != null) {
        // ask for Camera Permission if necessary
        if (error is CameraPermissionException) ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.CAMERA),
            permissionCode
        )
    }
}

override fun onAvailabilityChanged(readerDevice: ReaderDevice?) {
}

override fun onConnectionStateChanged(readerDevice: ReaderDevice?) {

}

override fun onReadResultReceived(readerDevice: ReaderDevice, results: ReadResults) {
    readerDevice.stopScanning()
    Toast.makeText(this, "Result Received. ${results.getResultAt(0).symbology}", Toast.LENGTH_LONG).show()
    Log.d("barcode" ,"MY BARCODE RESULT: ")

    if (results.subResults != null && results.subResults.size > 0) {
        for (subResult in results.subResults) {
            createResultItem(subResult)
        }
    } else if (results.count > 0) {
        createResultItem(results.getResultAt(0))
    }
}

private fun createResultItem(result: ReadResult) {
    val item =
        HashMap<String, String>()
    if (result.isGoodRead) {
        item["resultText"] = result.readString
        val sym = result.symbology
        if (sym != null) item["resultType"] =
            result.symbology.getName() else item["resultType"] =
            "UNKNOWN SYMBOLOGY"
    } else {
        item["resultText"] = "NO READ"
        item["resultType"] = ""
    }
    Toast.makeText(this, item["resultText"], Toast.LENGTH_SHORT).show()
}

override fun onRequestPermissionsResult(
    requestCode: Int,
    permissions: Array<out String>,
    grantResults: IntArray
) {
    if(requestCode == permissionCode){
        readerDevice.startScanning()
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
}

private fun enableSymbologies(){
    readerDevice.setSymbologyEnabled(Symbology.DATAMATRIX, true, object : OnSymbologyListener {
        override fun onSymbologyEnabled(
            reader: ReaderDevice,
            symbology: Symbology,
            enabled: Boolean,
            error: Throwable
        ) {
            Log.e(
                this.javaClass.simpleName,
                "Failed to enable Symbology.DATAMATRIX"
            )
        }
    })
    readerDevice.setSymbologyEnabled(Symbology.C128, true, object : OnSymbologyListener {
        override fun onSymbologyEnabled(
            reader: ReaderDevice,
            symbology: Symbology,
            enabled: Boolean,
            error: Throwable
        ) {
            Log.e(
                this.javaClass.simpleName,
                "Failed to enable Symbology.C128"
            )
        }
    })
    readerDevice.setSymbologyEnabled(Symbology.UPC_EAN, true, object : OnSymbologyListener {
        override fun onSymbologyEnabled(
            reader: ReaderDevice,
            symbology: Symbology,
            enabled: Boolean,
            error: Throwable
        ) {
            Log.e(
                this.javaClass.simpleName,
                "Failed to enable Symbology.UPC_EAN"
            )
        }
    })
    readerDevice.setSymbologyEnabled(Symbology.CODABAR, false, object : OnSymbologyListener {
        override fun onSymbologyEnabled(
            reader: ReaderDevice,
            symbology: Symbology,
            enabled: Boolean,
            error: Throwable
        ) {
            Log.e(
                this.javaClass.simpleName,
                "Failed to disable Symbology.CODABAR"
            )
        }
    })
    readerDevice.setSymbologyEnabled(Symbology.C93, false, object : OnSymbologyListener {
        override fun onSymbologyEnabled(
            reader: ReaderDevice,
            symbology: Symbology,
            enabled: Boolean,
            error: Throwable
        ) {
            Log.e(
                this.javaClass.simpleName,
                "Failed to disable Symbology.C93"
            )
        }
    })
    readerDevice.dataManSystem
        .sendCommand(
            "GET DEVICE.TYPE"
        ) { _, response ->
            if (response.error == null) {
                Log.d("Device type", response.payLoad)
            }
        }
    readerDevice.dataManSystem
        .sendCommand(
            "GET DEVICE.FIRMWARE-VER"
        ) { _, response ->
            if (response.error == null) {
                Log.d("Firmware version", response.payLoad)
            }
        }
}}

Manifest File Code:

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:hardwareAccelerated="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity"
        android:configChanges="orientation|screenSize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <meta-data android:name="MX_MOBILE_LICENSE"
        android:value="HERE I PUT MY KEY"/>
</application>