Bizarre id mixup in XML layout

I have a strange situation in which the android build seems to be reading the id of one element as belonging to another one.

Here is the relevant XML:

    <TextView 
        android:layout_marginTop="30dp"
        android:id="@+id/tour_explanation"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        style="@android:style/TextAppearance.DeviceDefault.Large"/>
    <LinearLayout
            android:layout_height="0dp"
            android:layout_width="match_parent"
            android:id="@+id/audio_container"
            android:orientation="horizontal">
        </LinearLayout>

This is the line in the code that produces the error:

((TextView)v.findViewById(R.id.tour_explanation)).setText(b.getString(ToursPagerAdapter.STATION_TEXT));

And this is the error:

java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView

For some reason, the id from the TextView is being associated with the LinearLayout. I tried the LinearLayout with and without a closing tag -- no difference. If I reverse the order and put the TextView after the LinearLayout, the error goes away.

What causes this? How can I make it go away?