title: How to fix "Unresolved reference " error in Kotlin Android Studio 3.3
body: <p>I'm new to kotlin and Andriod studio. I was following a tutorial and everything was going smoothly until I received a ton of &quot;Unresolved reference errors&quot;</p>
  <p>I looked at other peoples post concerning this problem but nothing seemed to help as I still receive multiple errors</p>
  <p><strong>I tried:</strong></p>
  <ul>
  <li>Build -&gt; Clean -&gt; Build -&gt; Rebuild.</li>
  <li>File -&gt; Invalidate Caches and Restart</li>
  <li>delete .idea/libraries -&gt; File -&gt; Sync Project with Gradle Files.</li>
  </ul>
  <p>Here is my version information</p>
  <p><code>Android Studio 3.3.1 Build #AI-182.5107.16.33.5264788, built on January 28, 2019  JRE: 1.8.0_152-release-1248-b01 amd64 JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o Windows 10 10.0</code></p>
  <p><strong>My code</strong></p>
  <pre><code>package e.lakal.tapfighter
  
  import android.content.ContentValues.TAG
  import android.os.Bundle
  import android.os.CountDownTimer
  import android.os.PersistableBundle
  import android.support.design.widget.Snackbar
  import android.support.v7.app.AppCompatActivity
  import android.util.Log
  import android.view.Menu
  import android.view.MenuItem
  import android.widget.Button
  import android.widget.TextView
  import android.widget.Toast
  import kotlinx.android.synthetic.main.activity_main.*
  
  class MainActivity : AppCompatActivity() {
  
  internal lateinit var  tapmeButton: Button;
  internal lateinit var GameScore: TextView;
  internal lateinit var  Timer: TextView;
  internal var  Score = 0
  internal  var gameStarted = false
  
  internal lateinit var countDownTimer : CountDownTimer
  internal  val  initalCountDown: Long = 60000;
  internal  val  CountDownInterval: Long = 1000;
  internal val TAG = MainActivity::class.java.simpleName
  internal val timeLeftonTimer : Long = 6000
  
  
  companion object {
    private val SCORE_KEY =&quot;SCORE_KEY&quot;
    private val TIME_LEFT_KEY = &quot;TIME_LEFT_KEY&quot;
     }
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      Log.d(TAG, &quot;On create called. Score is $Score&quot;)
      setSupportActionBar(toolbar)
  
      fab.setOnClickListener { view -&gt;
          Snackbar.make(view, &quot;Replace with your own action&quot;, 
        Snackbar.LENGTH_LONG)
              .setAction(&quot;Action&quot;, null).show()
      }
  
      tapmeButton = findViewById&lt;Button&gt;(R.id.tapmeButton)
      GameScore = findViewById&lt;TextView&gt;(R.id.GameScore)
      Timer = findViewById&lt;TextView&gt;(R.id.Timer)
      GameScore.text = getString(R.string.YourScore, Score.toString())
  
    tapmeButton.setOnClickListener{  view -&gt;
        incrementScore()
     }
      resetGame()
       }
  
  
  
  
  private fun resetGame(){
  
      Score = 0
      GameScore.text = getString(R.string.YourScore, Score.toString())
      val initalTimeLeft = initalCountDown / 1000
      Timer.text = getString(R.string.TimeLeft, 
        initalTimeLeft.toString())
  
      countDownTimer =  object: CountDownTimer(initalCountDown, 
       CountDownInterval) {
          override fun onTick(millisUntilFinished: Long) {
             val  timeLeft = millisUntilFinished / 1000
              Timer.text = getString(R.string.TimeLeft, 
      timeLeft.toString())
          }
  
          override fun onFinish() {
           endGame()
          }
      }
   gameStarted =false;
  }
  
  
    // Starts giving me problems here
  
  }
   private fun startGame(){
      countDownTimer.start()
      gameStarted
   }
  
  
    override fun onSaveInstanceState(outState: Bundle?, 
    outPersistentState: PersistableBundle?) {
      super.onSaveInstanceState(outState, outPersistentState)
  
      outState?.putInt(SCORE_KEY, Score)
      outState?.putLong(TIME_LEFT_KEY, timeLeftonTimer)
      countDownTimer.cancel()
  
      Log.d(TAG,&quot;onSaveInstanceState : Saving score : $Score &amp; Saving 
   Time  current $timeLeftonTimer&quot;)
  
  }
    override fun onDestroy(){
      super.onDestroy()
       Log.d(TAG, &quot;onDestroy called.&quot;)
   }
  
  
  private fun endGame(){
      Toast.makeText(this, getString(R.string.game_over_msg, Score.toString()), Toast.LENGTH_SHORT).show()
      resetGame()
  
  }
  private fun incrementScore() {
          if(!gameStarted){
              startGame() }
      Score++
      val newScore = getString(R.string.YourScore, Score.toString())
      GameScore.text = newScore
  }
  
  
  
  override fun onCreateOptionsMenu(menu: Menu): Boolean {
  
      menuInflater.inflate(R.menu.menu_main, menu)
      return true
  }
  
  override fun onOptionsItemSelected(item: MenuItem): Boolean {
  
      return when (item.itemId) {
          R.id.action_settings -&gt; true
          else -&gt; super.onOptionsItemSelected(item)
      }
  }
  }
  </code></pre>
  <p>Logcat</p>
  <pre><code>019-02-24 17:49:13.359 2003-6170/? E/WakeLock: GCM_HB_ALARM release 
  without a matched acquire!2019-02-24 17:49:13.450 1641-1769/? 
  I/WifiService: getConnectionInfo uid=10013
  2019-02-24 17:49:58.235 1641-1769/? D/WificondControl: Scan result 
   ready event
   2019-02-24 17:50:00.008 1641-1654/? E/memtrack: Couldn't load 
   memtrack module
   2019-02-24 17:50:00.008 1641-1654/? W/android.os.Debug: failed to 
   get memory consumption info: -1
   2019-02-24 17:50:00.016 1436-1454/? D/hwcomposer: hw_composer sent 
    6 syncs in 60s
   2019-02-24 17:50:00.111 1443-1443/? I/boot-pipe: done populating 
   /dev/random
   2019-02-24 17:50:15.532 1641-1658/? E/BatteryExternalStatsWorker: 
   modem info is invalid: ModemActivityInfo{ mTimestamp=0 
   mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] 
    mRxTimeMs=0 mEnergyUsed=0}
  </code></pre>