DialogPreference causes FC

I'm trying to implement a DialogPreference in the preferences layout. Unfortunatly, the code below always causes a force close. EditTextPreferences work well but I need a simple dialog. Any suggestions what's wrong here?

<DialogPreference
        android:id="@+id/reset_languages"
        android:negativeButtonText="@string/no"
        android:positiveButtonText="@string/yes"
        android:dialogTitle="@string/reset_l开发者_如何学JAVAanguages"
        android:dialogMessage="@string/reset_languages_confirmation"
        android:title="@string/reset_languages"
        android:summary="@string/reset_languages_summ" />

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Solved by extending the DialogPreferences class