Problem: Error while preparing query<br>SELECT b.title, b.url, b.cover, b.description, b.book_id AS groupedByBookID, b.language
                FROM msk_books AS b
               WHERE b.mainswitch = 1
                 AND b.production = 1
                 AND b.meeting_id = 
            GROUP BY b.book_id
            ORDER BY b.published_at DESC

<br>Type of error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP BY b.book_id
            ORDER BY b.published_at DESC' at line 6