Hi,
The results page is controlled by the theme you are using. Any customization regarding it’s layout has to be made via the theme settings, or programmatically via a child theme.
The error reported refers to the avada core template files, there is very likely something wrong in there. Try turning off Ajax Search Pro, and revisit the search results page to see if the error is still there – it should be. If so, then you may need to contact the theme support about that.