Error reading Android SQLite database using Kotlin

When running the code below I get the error message:

java.lang.RuntimeException: Unable to start activity
 ComponentInfo{com.example.songapp/com.example.songapp.MainActivity}: java.io.FileNotFoundException:
 /data/data/com.example.songapp/databases/songs.db: open failed: ENOENT (No such file or directory)

The code that gives error is this:

@Throws(IOException::class)
fun copyDataBase(context: Context, OUTPUT_DB_PATH: String, DB_NAME: String) {
    print("*** in copyDataBase ***")
    // Path to output database path (application database path).
    var APP_DB_FILE_PATH = OUTPUT_DB_PATH + "/" + DB_NAME

    // Path to input database file.
    var INPUT_DB_PATH = "database/" + DB_NAME

    // Open your local db as the input stream
    // This is how to get path from assets directory
    val databaseInput: InputStream = context.assets.open(INPUT_DB_PATH)

    // Open the empty db as the output stream
    val databaseOutput: OutputStream = FileOutputStream(APP_DB_FILE_PATH)

    // Transfer bytes from the inputfile to the outputfile
    val buffer = ByteArray(1024)
    var length: Int
    while (databaseInput.read(buffer).also { length = it } > 0) {
        databaseOutput.write(buffer, 0, length)
    }

    // Close the streams
    databaseOutput.flush()
    databaseOutput.close()
    databaseInput.close()
}

This is being called in the main activity as follows:

var DB_PATH = "/data/data/com.example.songapp/databases/"
var DB_NAME = "songs.db"

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // Get context and supply it to the function
        // This is where error happens, by disabling this the app run successful.
        copyDataBase(this, DB_PATH, DB_NAME)

        setContent {
            Column() {
                TopAppBar(title = { Text(text = "Nyimbo") })
                ScrollableColumn(Modifier.fillMaxWidth()
                    .padding(10.dp)) {
                    lyricsPageComposable(lyricsMap = songMap)
                }
            }
        }
    }
}

I have a pre-populated SQLite database in the assets directory assets/database/songs.db and I expect it to be copied into /data/data/com.example.songapp/databases/songs.db. I do not know how to check whether copying has succeeded. What am I missing here? I know that the database file could not be found. Is that the path is not right? Could it be that the database was not copied? How could I tell? I'm using a physical Android phone for testing the app.