Conversion failed when converting the nvarchar value '2,3' to data type int.....?

( SELECT CONCAT(Cities.FK_PrimaryLanguage_ID,',',Cities.FK_SecondaryLanguages_ID)
           FROM Cities  WHERE ID= 1)

ALTER proc [dbo].[Sp_GetMoviesWith_ReviewList]
(

@city int
)
as
begin 
select  m.ID AS id ,m.ReleaseDate AS rdate ,m.MovieName AS title
          
		    --,(  SELECT avg(Reviews.Rating)  FROM Reviews WHERE Reviews.FK_Movie_ID = m.ID) as rating
		    ,dbo.Movierating(m.ID) as rating 
			 --,re.Rating
            ,L.Language AS LANGUAGE
			,m.status AS isactive
			
			,m.MobileThumbnailImage AS thumbnail
			,( SELECT CASE WHEN COUNT(Trailers.ID)>0 THEN 'true' ELSE 'false' END FROM Trailers WHERE Trailers.FK_Movies_ID = m.ID) AS hastrailers
			,( SELECT CASE WHEN COUNT(Reviews.FK_Movie_ID)>0 THEN 'true' ELSE 'false' END FROM Reviews WHERE Reviews.FK_Movie_ID =  m.ID) AS hasreviews
			,m.Description AS description
			,m.cast AS casting
						
		  FROM Movies as m
		  INNER JOIN Languages L ON m.FK_Languages_ID = L.ID
	      --INNER JOIN Reviews re ON re.ID = m.ID
		  INNER JOIN Theatres ON Theatres.ID = m.ID	
		 
		  WHERE m.status = 1 AND
		    
		  m.FK_Languages_ID IN
		      ( SELECT CONCAT(Cities.FK_PrimaryLanguage_ID,',',Cities.FK_SecondaryLanguages_ID) 
			--FROM Cities  WHERE ID= @city)

Conversion failed when converting the nvarchar value '2,3' to data type int.