I have just attached a SP2010 site collection to a SP2013 farm. One of the page contains a Core Results Web Part and a Refinement Web Part. I run the site in both SP2010 mode and SP2013-eval mode. The Core results webpart always return "Scope in your query does not exist".
May I know is it possible to convert it to suit SP2013 settings? Is it possible?
P.S. I try create a blank new site collection and add a SP2013 OOB core result webpart. It works as expected so I think the search service application is correctly setup.