Stuck with an query that getting async error - entity-framework

Question

I have a controller wich contains follows:
List<Game> gamesRat = new List<Game>();
if (selectedRating.Count() != 0)//User select any checkboxes
{
FilterGamesByRating(gamesRat, selectedRating, "Shooter");//Filter by user inputs
my = true;//Boolean
}
So the my question is:
when i try to return a View:
return View(await PaginatedList<Game>.CreateAsync(gamesRat.AsQueryable(), page ?? 1, pSize));
I get the following error:
The provider for the source IQueryable doesn't implement IAsyncQueryProvider. Only providers that implement IEntityQueryProvider can be used for Entity Framework asynchronous operations
But when in other method, i put that query:
IQueryable<Game> games = _context.Games.Where(x => x.Category == "Shooter");
return View(await PaginatedList<Game>.CreateAsync(games, page ?? 1, pSize));
It works perfectly. How can i fix that error? Thanks.
Of course, my PaginatedList method:
public class PaginatedList<T> : List<T>
{
public int PageIndex { get; private set; }
public int TotalPages { get; private set; }
public PaginatedList(List<T> items, int count, int pageIndex, int pageSize)
{
PageIndex = pageIndex;
TotalPages = (int)Math.Ceiling(count / (double)pageSize);
this.AddRange(items);
}
public bool HasPreviousPage
{
get
{
return (PageIndex > 1);
}
}
public bool HasNextPage
{
get
{
return (PageIndex < TotalPages);
}
}
public static async Task<PaginatedList<T>> CreateAsync(IQueryable<T> source, int pageIndex, int pageSize)
{
var count = await source.CountAsync();
var items = await source.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToListAsync();
return new PaginatedList<T>(items, count, pageIndex, pageSize);
}
}