[MYSQL]Błąd przy Join'ach Opcje

[daniel1302]

Witam mam takie zapytanie

[SQL] pobierz, plaintext 
SELECT
				a.title, a.id, a.owner, a.added, u.user_name, u.user_id, AVG(n.note) AS srednia, n.type
			FROM ".$prefix."_articles AS a
				LEFT JOIN ".$prefix."_users AS u ON a.owner=u.user_id
				LEFT JOIN ".$prefix."_notes AS n ON n.text_id=a.id
			WHERE ".$_whereAccept." AND n.type='A' ORDER BY srednia DESC LIMIT 5
[SQL] pobierz, plaintext 

I zwraca mi taki błąd

Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause

Zapytanie wkładam do pętli while z góry dziękuje za odpowiedz