[android help] Using ViewGroup within custom component

I've created a custom Card widget for use in my Android application, as shown here:

    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    style="@style/CardBaseTheme"
    android:orientation="vertical">
            android:textIsSelectable="true"
        android:id="@+id/cardTitle"
        style="@style/CardTitleTheme"/>
            android:textIsSelectable="true"
        android:id="@+id/cardContent"
        style="@style/CardTextTheme"/>

Now i would like to make this widget more generic by replacing the second TextView with a ViewGroup component, so that I can define cards using:

    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    app:card_title="@string/about_header1">

    

However, this doesn't seem to work. LogCat only states error inflating class android.view.ViewGroup, which doesn't really help me either.

What would be the correct way to do this?

UPDATE:

LogCat stacktrace here

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