Unexpected namespace prefix "app" found for tag RelativeLayout - Android?
<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>