My app crashes as soon as I click on OK after selecting the date

This is the code that I used in kotlin and it is running fine but the app crashes as soon as I click ok after selecting the Date of Birth. The app worked fine till displaying just the date but it is crashing as soon as I used the minutes

fun Calendara(){

    val Mycalendar= Calendar.getInstance()
    val Year=Mycalendar.get(Calendar.YEAR)
    val month=Mycalendar.get(Calendar.MONTH)
    val DayOfMonth=Mycalendar.get(Calendar.DAY_OF_MONTH)
    var dpd=DatePickerDialog(this,
        DatePickerDialog.OnDateSetListener { _, year, Month, dayOfMonth ->
           Toast.makeText(this,"$DayOfMonth-$month-$Year",Toast.LENGTH_LONG).show()
            val selectedDate="$DayOfMonth/${month+1}/$Year"
            datet?.text=selectedDate

            val sdf=SimpleDateFormat("dd.MM.yyyy", Locale.ENGLISH)
             val thedate=sdf.parse(selectedDate?.toString())

             val thedateinMinutes = thedate.time / 60000

            val currentdate = System.currentTimeMillis() / 60000

            val difference = currentdate - thedateinMinutes


            minutes?.text = difference.toString()

                                           },
        Year,
        month,
        DayOfMonth
    )
    dpd.datePicker.maxDate=System.currentTimeMillis()-8640000
     dpd.show()

   }

}

Above is the code and below is the errow which is displayed when I run through the debugger

Error:

The output should display the date we selected and your age in minutes