Constraint Error

gistfile1.txt

<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">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/gradient_background"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <ImageButton
                android:id="@+id/btnClose"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="start"
                android:background="@drawable/ic_arrow_back_black_24dp" />

            <TextView
                style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="40dp"
                android:layout_marginStart="40dp"
                android:gravity="center"
                android:text="User Detail"
                android:textColor="#FFFFFF"
                android:textSize="25sp" />

            <ImageButton
                android:id="@+id/btnEdit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="end"
                android:layout_marginEnd="10dp"
                android:layout_marginRight="10dp"
                android:background="@drawable/ic_mode_edit_white_24dp" />

        </android.support.v7.widget.Toolbar>

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <de.hdodenhof.circleimageview.CircleImageView
                android:id="@+id/my_pic"
                android:layout_width="@dimen/dp_150dp"
                android:layout_height="@dimen/dp_150dp"
                android:layout_marginBottom="50dp"
                android:layout_marginTop="5dp"
                android:src="@drawable/sahil"
                app:civ_border_color="#707070"
                app:civ_border_width="1dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/my_blood_group"
                style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginEnd="8dp"
                android:layout_marginLeft="8dp"
                android:layout_marginRight="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:background="@drawable/bloodgroup_border"
                android:paddingBottom="2dp"
                android:paddingEnd="@dimen/dp_8"
                android:paddingStart="@dimen/dp_8"
                android:paddingTop="2dp"
                android:textColor="#EA2D4F"
                android:textSize="20sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toBottomOf="@+id/my_pic"
                app:layout_constraintEnd_toEndOf="@+id/my_pic"
                app:layout_constraintStart_toStartOf="@+id/my_pic"
                app:layout_constraintTop_toBottomOf="@+id/my_pic"
                app:layout_constraintVertical_bias="0.542"
                tools:text="B +" />

        </android.support.constraint.ConstraintLayout>
    </android.support.design.widget.AppBarLayout>

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="@dimen/dp_100"
        android:layout_height="@dimen/dp_150dp"
        android:adjustViewBounds="true"
        android:src="@drawable/donatecounter"
        app:layout_constraintBottom_toBottomOf="@+id/appBarLayout"
        app:layout_constraintEnd_toEndOf="@+id/appBarLayout"
        app:layout_constraintHorizontal_bias="0.1"
        app:layout_constraintStart_toStartOf="@+id/appBarLayout"
        app:layout_constraintTop_toBottomOf="@+id/appBarLayout" />

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="@dimen/dp_100"
        android:layout_height="@dimen/dp_150dp"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        app:layout_constraintBottom_toBottomOf="@+id/appBarLayout"
        app:layout_constraintEnd_toEndOf="@+id/appBarLayout"
        app:layout_constraintHorizontal_bias="0.91"
        app:layout_constraintStart_toStartOf="@+id/appBarLayout"
        app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
        app:srcCompat="@drawable/requestcounter" />

    <ImageView
        android:id="@+id/imageView5"
        android:layout_width="@dimen/dp_150dp"
        android:layout_height="40dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toStartOf="@id/imageView3"
        app:layout_constraintStart_toEndOf="@id/imageView4"
        app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
        app:srcCompat="@drawable/heartbeat" />

    <TextView
        android:id="@+id/my_donation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:textColor="#EA2D4F"
        app:layout_constraintBottom_toBottomOf="@id/imageView4"
        app:layout_constraintEnd_toEndOf="@+id/imageView4"
        app:layout_constraintHorizontal_bias="0.571"
        app:layout_constraintStart_toStartOf="@id/imageView4"
        app:layout_constraintTop_toTopOf="@id/imageView4"
        app:layout_constraintVertical_bias="0.786"
        tools:text="6 Times" />

    <TextView
        android:id="@+id/my_request"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:textColor="#EA2D4F"
        app:layout_constraintBottom_toBottomOf="@id/imageView3"
        app:layout_constraintEnd_toEndOf="@+id/imageView3"
        app:layout_constraintHorizontal_bias="0.571"
        app:layout_constraintStart_toStartOf="@id/imageView3"
        app:layout_constraintTop_toTopOf="@id/imageView3"
        app:layout_constraintVertical_bias="0.786"
        tools:text="3 Times" />

</android.support.constraint.ConstraintLayout>