title: Unexpected namespace prefix "app" found for tag RelativeLayout - Android?
body: <p>I need to use <code>BottomSheetBehavior</code> with <code>ScrollView</code> but it says to me :</p>
  
  <pre><code>Unexpected namespace prefix "app" found for tag RelativeLayout
  
  app:behavior_hideable="true"
  app:behavior_peekHeight="80dp"
  </code></pre>
  
  <p>Here is my xml :</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
          &lt;android.support.design.widget.AppBarLayout
              android:id="@+id/ABLList"
              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;LinearLayout
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:gravity="end"
                      android:orientation="horizontal"&gt;
  
                      &lt;ImageButton
                          android:id="@+id/imbDetail"
                          android:layout_width="wrap_content"
                          android:layout_height="wrap_content"
                          android:layout_gravity="end|center_vertical"
                          android:layout_marginRight="10dp"
                          android:background="@null"
                          android:src="@drawable/ic_action_detail" /&gt;
                  &lt;/LinearLayout&gt;
              &lt;/android.support.v7.widget.Toolbar&gt;
  
          &lt;/android.support.design.widget.AppBarLayout&gt;
  
          &lt;android.support.v7.widget.RecyclerView
              android:id="@+id/recycler_OrderList"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_below="@+id/ABLList"
              android:scrollbars="vertical" /&gt;
      &lt;/RelativeLayout&gt;
  
      &lt;ScrollView
          xmlns:app="http://schemas.android.com/apk/res-auto"
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;
  
          &lt;RelativeLayout
              android:id="@+id/layout_bottom_sheet_ListOrder"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_gravity="top"
              android:background="@color/color_bottom_sheet"
              android:gravity="top"
              app:behavior_hideable="true"
              app:behavior_peekHeight="80dp"
              app:layout_behavior="@string/string_bottom_sheet_behavior"&gt;
  
              &lt;com.example.asheq.utils.TextViewJus
                  android:id="@+id/txtAddress"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginTop="@dimen/text_marginTop"
                  android:gravity="right"
                  android:maxLines="5"
                  android:paddingLeft="@dimen/activity_vertical_margin"
                  android:paddingRight="@dimen/activity_vertical_margin"
                  android:textSize="@dimen/text_size"
                  android:textStyle="bold" /&gt;
  
              &lt;Button
                  android:id="@+id/btnSReport"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_below="@+id/txtCTime"
                  android:layout_marginTop="50dp"
                  android:text="@string/btnReport" /&gt;
  
          &lt;/RelativeLayout&gt;
      &lt;/ScrollView&gt;
  
      &lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/coordinatorOrder"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_alignParentBottom="true" /&gt;
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>