error: duplicate value for resource 'attr/tint' with config ''

[DarrenWorks]

In my project. I should delete format="string" in

<declare-styleable name="NestedRadioGroup">
        <attr name="checkedButton" format="reference"/>
        <attr name="orientation"/>
    </declare-styleable>

don't know why. Maybe because the format of 'oratation' has already been defined before in sdk. Wish this info can help you fix it.