HTML element box not displaying in search page

Hi, I want to display one ad in search page after the search result. For this I tried to find the html element which is used to display search result but html selector is not loading for the search page. For all other pages its loading but for search page alone it is not loading. When I click the search button from home page, search page is loading without ad-inserter html element selector box.
I kindly request you to help me on this.

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