duplicate resource error

<declare-styleable name="TaboolaWidget">
        <attr format="string" localization="suggested" name="publisher"/>
        <attr format="string" localization="suggested" name="mode"/>
        <attr format="string" localization="suggested" name="placement"/>
        <attr format="string" localization="suggested" name="page_type"/>
        <attr format="string" localization="suggested" name="target_type"/>
        <attr format="string" localization="suggested" name="url"/>
        <attr format="boolean" localization="suggested" name="auto_resize_height"/>
        <attr format="boolean" localization="suggested" name="scroll_enabled"/>
        <attr format="boolean" localization="suggested" name="item_click_enabled"/>

error: duplicate value for resource 'attr/mode' with config ''.