title: RecyclerViewCalendar must not be null
body: <p>I am currently creating a custom Dialog to show hours from 00:00 to 23:59, I am using kotlin as language of development. My problem is that when I open the dialog there is an error on the recycler view. This is my code</p>
  
  <p><strong>Calendar Dialog Class</strong></p>
  
  <pre><code>class CalendarDialog : DialogFragment() {
  
      /**
       * Define variables
       */
      private val mDaysList : MutableList&lt;Days&gt; = ArrayList()
      private val dayMonthYear = "2018-06-14" //TODO fetch the date of today
  
      /**
       * Initialize the adapter
       */
      private val adapter = CalendarAdapter(mDaysList)
  
      /**
       * Initialize the layout manager
       */
      private fun getLinearLayoutManager(): LinearLayoutManager {
          return LinearLayoutManager(activity, LinearLayoutManager.HORIZONTAL, false)
      }
  
      private fun initView() {
          setDataListItems()
          recyclerViewCalendar?.adapter = adapter
          recyclerViewCalendar?.layoutManager = getLinearLayoutManager()
          recyclerViewCalendar?.setHasFixedSize(true)
      }
  
      override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
          val rootView = inflater.inflate(R.layout.calendar_dialog, container)
          initView()
          return rootView
      }
  
  
      /**
       * TODO dependendo do horário da clinica bloqueio e desbloqueio horários
       */
      private fun setDataListItems() {
          mDaysList.add(Days("06:00", dayMonthYear))
          mDaysList.add(Days("06:30", dayMonthYear))
          mDaysList.add(Days("07:00", dayMonthYear))
          mDaysList.add(Days("07:30", dayMonthYear))
          mDaysList.add(Days("08:00", dayMonthYear))
          mDaysList.add(Days("08:30", dayMonthYear))
          mDaysList.add(Days("09:00", dayMonthYear))
          mDaysList.add(Days("09:30", dayMonthYear))
          mDaysList.add(Days("10:00", dayMonthYear))
          mDaysList.add(Days("10:30", dayMonthYear))
          mDaysList.add(Days("11:00", dayMonthYear))
          mDaysList.add(Days("11:30", dayMonthYear))
          mDaysList.add(Days("12:00", dayMonthYear))
          mDaysList.add(Days("12:30", dayMonthYear))
          mDaysList.add(Days("13:00", dayMonthYear))
          mDaysList.add(Days("13:30", dayMonthYear))
          mDaysList.add(Days("14:00", dayMonthYear))
          mDaysList.add(Days("14:30", dayMonthYear))
          mDaysList.add(Days("15:00", dayMonthYear))
          mDaysList.add(Days("15:30", dayMonthYear))
          mDaysList.add(Days("16:00", dayMonthYear))
          mDaysList.add(Days("16:30", dayMonthYear))
          mDaysList.add(Days("17:00", dayMonthYear))
          mDaysList.add(Days("17:30", dayMonthYear))
          mDaysList.add(Days("18:00", dayMonthYear))
          mDaysList.add(Days("18:30", dayMonthYear))
          mDaysList.add(Days("19:00", dayMonthYear))
          mDaysList.add(Days("19:30", dayMonthYear))
          mDaysList.add(Days("20:00", dayMonthYear))
          mDaysList.add(Days("20:30", dayMonthYear))
      }
  
  }
  </code></pre>
  
  <p><strong>Item.xml</strong></p>
  
  <pre><code>&lt;android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:paddingLeft="16dp"
      android:paddingRight="16dp"&gt;
  
      &lt;android.support.design.widget.TextInputLayout
          android:id="@+id/client_id_input_layout"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:layout_marginBottom="8dp"
          app:layout_constraintBottom_toTopOf="@+id/guideline"
          android:layout_marginRight="8dp"
          app:layout_constraintRight_toRightOf="parent"
          android:layout_marginLeft="8dp"
          app:layout_constraintLeft_toLeftOf="parent"&gt;
  
          &lt;TextView
              android:id="@+id/hourOfDay"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:fontFamily="monospace"
              android:gravity="center"
              android:text="00:00"
              android:textColor="@color/picker_default_selected_text_color"
              android:textSize="36sp"
              android:textStyle="bold" /&gt;
  
      &lt;/android.support.design.widget.TextInputLayout&gt;
  
  
      &lt;android.support.constraint.Guideline
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:id="@+id/guideline"
          android:orientation="horizontal"
          app:layout_constraintGuide_percent="0.5"/&gt;
  
      &lt;TextView
          android:id="@+id/day_month_year"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_marginEnd="8dp"
          android:layout_marginStart="8dp"
          android:text="22 Agosto 2018"
          android:textStyle="bold|italic"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="@+id/guideline" /&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p><strong>Model class</strong></p>
  
  <pre><code>data class Days(var hourOfDay:String ,var dayMonthYear:String)
  </code></pre>
  
  <p><strong>Calendar dialog layout xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="#f4f2f2"
      app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:id="@+id/recyclerViewCalendar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"/&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p><strong>Fragment class ( Where I call the dialog)</strong></p>
  
  <pre><code>class BlockSchedulesFragment : BaseFragment&lt;BlockSchedulesViewModel&gt;() {
  
  
      /**
       * Call this fragment in the parent activity
       */
      companion object {
          fun  newInstance() = BlockSchedulesFragment()
      }
  
  
      /**
       * Base fragment methods
       */
  
      override fun layoutToInflate() = R.layout.fragment_block_shedules_screen
  
      override fun definedViewModel() = ViewModelProviders.of(this, Injection.provideViewModelBlockerFactory(context))
              .get(BlockSchedulesViewModel::class.java)
  
      override fun doOnCreated(savedInstanceState: Bundle?) {
  
         //I do the call to the dialog here
          val fm = fragmentManager
          val tv = CalendarDialog()
  
          open_calendar_btn.setOnClickListener {
              tv.show(fm,"TV_tag")
          }
  
          confirm_block.setOnClickListener {
              Toast.makeText(activity,"Bloqueio efectuado",Toast.LENGTH_SHORT).show()
          }
  
      }
  }
  </code></pre>