title: No drawer view found with gravity LEFT
body: <p>When I run the app and click on the toolbar icon I get the error as " No drawer view found with gravity LEFT"</p>
  
  <p>this is my xml file</p>
  
  <p><strong>main.xml</strong></p>
  
  <pre><code>&lt;android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:id="@+id/drawer_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fitsSystemWindows="true" &gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical" &gt;
  
          &lt;android.support.v7.widget.Toolbar
              android:id="@+id/my_awesome_toolbar"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:background="?attr/colorPrimary"
              android:minHeight="?attr/actionBarSize" /&gt;
  
          &lt;android.support.v7.widget.RecyclerView
              android:id="@+id/book_list_rv_list"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:scrollbars="vertical" /&gt;
  
          &lt;ListView
              android:id="@+id/ListView1"
              android:layout_width="241dp"
              android:layout_height="match_parent"
              android:layout_gravity="start"
              android:background="#333"
              android:choiceMode="singleChoice"
              android:divider="#666"
              android:dividerHeight="1dp"
              android:paddingLeft="15sp"
              android:paddingRight="15sp" /&gt;
      &lt;/LinearLayout&gt;
  
  &lt;/android.support.v4.widget.DrawerLayout&gt;
  </code></pre>
  
  <p>this id the code snippet of the activity java file
  <strong>activity file</strong></p>
  
  <pre><code>Toolbar mToolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
          mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
  
          // drawer
          setSupportActionBar(mToolbar);
          mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                  mToolbar, R.string.app_name, R.string.app_name);
          mDrawerLayout.setDrawerListener(mDrawerToggle);
  </code></pre>