I am getting following error when I select on any of the section ('Air Tools', 'Automative').

System.UriFormatException: Invalid URI: The hostname could not be parsed.

Source Error:
Line 56: }
Line 57: var query = BuildSearchQuery(currentContent, filterOptions);
Line 58: var searchResults = query.GetContentResult();
Line 59:
Line 60: CustomSearchResult returnedResults = new CustomSearchResult

Thanks in advance.