title: ButterKnife 8.0.1 not working
body: <p>I am using <code>butterknife 8.0.1</code>, but a <code>nullpointerexception</code> is appearing.</p>
  
  <p>This line is on my build.grade file: 
          <code>compile 'com.jakewharton:butterknife:8.0.1'</code></p>
  
  <p>this is my <code>Main Class:</code> (I wrote the includes properly)</p>
  
  <pre><code>import butterknife.BindView;
  import butterknife.ButterKnife;
  
  public class MainActivity extends BaseActivity {
  
      @BindView(R.id.MainScreenTextView) TextView mainText;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          ButterKnife.bind(this);
  
          **mainText.setText("Butter knife is working fine");**
      }
  </code></pre>
  
  <p>and this is <code>MainActivity.xml</code>:</p>
  
  <p>
  </p>
  
  <pre><code>&lt;android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppTheme.AppBarOverlay"&gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="?attr/colorPrimary"
          app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:gravity="center_vertical"
      android:orientation="vertical"&gt;
  
      &lt;TextView
          android:id="@+id/MainScreenTextView"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="This is the Main Screen"
          android:textColor="#000000"
          android:background="#666666"
          android:padding="5dp"
          android:textSize="20dp"/&gt;
  &lt;/LinearLayout&gt;
  
  &lt;android.support.design.widget.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="bottom|end"
      android:layout_margin="@dimen/fab_margin"
      android:src="@android:drawable/ic_dialog_email" /&gt;
  </code></pre>
  
  <p></p>