render error 1

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.poging3.MainActivity">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/crypto_bg"
        android:scaleType="fitXY"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:srcCompat="@drawable/bg1" />

    <ImageButton
        android:id="@+id/imageButton2"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginBottom="32dp"
        android:layout_marginStart="32dp"
        android:contentDescription="@string/channel_pic"
        android:onClick="goToUrl"
        android:scaleType="fitCenter"
        android:tint="@drawable/tglogo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:srcCompat="@drawable/tglogo" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="183dp"
        android:layout_height="72dp"
        android:layout_marginBottom="32dp"
        android:layout_marginEnd="32dp"
        android:text="@string/url_pic_msg"
        android:textAppearance="@style/TextAppearance.AppCompat.Caption"
        android:textColor="@android:color/white"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="350dp"
        android:layout_height="155dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:contentDescription="@string/swing_picture"
        android:scaleType="fitXY"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/btctrend" />

</android.support.constraint.ConstraintLayout>