SQL server Group by error

Question

hi All,

I have this query I need to return Books with its category

SELECT     BOOKS.NO,
               BOOKS.NAME,
               BOOKS.COUNTRY,
               SELECTED_CATEGORY.CATEGORY_ID,
               CATEGORY.CATEGORY_NAME

FROM        SELECTED_CATEGORY INNER JOIN
                      BOOKS ON SELECTED_CATEGORY.CATEGORY_ID = BOOKS.NO INNER JOIN
                      CATEGORY ON SELECTED_CATEGORY.CATEGORY_ID = CATEGORY.ID
                     
Group by BOOKS.NO;


each Book has multiple categories , i used for that purpose the group by option in SQL but it gives me an error

Msg 8120, Level 16, State 1, Line 1
Column 'BOOKS.NAME' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.