“未能实例化一个或多个类”错误在XML, Android Studio中

XML Code:

XML代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:tools="https://schemas.android.com/tools"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    android:id="@+id/bgLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:paddingTop="24dp">

            <Button
                android:id="@+id/button_1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="@string/button1"
                android:padding="16dp"
                android:layout_margin="8dp"/>

            <Button
                android:id="@+id/button_2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="16dp"
                android:layout_margin="8dp"
                android:text="@string/button2"/>

            <Button
                android:id="@+id/button_3"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="16dp"
                android:layout_margin="8dp"
                android:text="@string/button3"/>
        </LinearLayout>
    </ScrollView>

</android.support.design.widget.CoordinatorLayout>
<?xml version="1.0" encodi