title: Kotlin: Unresolved reference: Textview
body: <p>I am new to Kotlin and android in general.</p>
  <p>Currently making an app that is supposed to calculate a persons age in minutes, however Im getting an  error saying &quot;Unresolved reference: TextView&quot;. The thing is, as you can see, I've already imported widget.Textview.</p>
  <p>Please help... I'm stuck on such a trivial problem. Thank you.</p>
  <p>P.S. There have been similar questions, but the solutions either aren't applicable or have already been applied.</p>
  <pre><code>
  import android.app.DatePickerDialog
  import android.content.ReceiverCallNotAllowedException
  import androidx.appcompat.app.AppCompatActivity
  import android.os.Bundle
  import android.widget.TextView
  import android.widget.Button
  import android.widget.Toast
  import java.util.*
  
  class MainActivity : AppCompatActivity() {
  
      private var tvSelectedDate : Textview? = null
  
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.activity_main)
  
          val btndate : Button = findViewById(R.id.btndate)
          tvSelectedDate = findViewById(R.id.tvSelectedDate)
          btndate.setOnClickListener {
              clickDatePicker()
          }
      }
  ...
  </code></pre>