SQL-Fehler bei Suche

Wenn man die Suchfunktion über den Inhalt nutzt bekomme ich folgende Fehlermeldung:

# user warning: Operand should contain 1 column(s) query: SELECT COUNT(*) FROM (SELECT i.type, i.sid, 5 * (4,51999567535 * SUM(i.score * t.count)) + 5 * POW(2, (GREATEST(MAX(n.created), MAX(n.changed), MAX(c.last_comment_timestamp)) - 1237064127) * 6.43e-8) + 5 * (2.0 - 2.0 / (1.0 + MAX(c.comment_count) * 0,1)) + 5 * (2.0 - 2.0 / (1.0 + MAX(nc.totalcount) * 0,00126422250316)) AS score FROM search_index i INNER JOIN search_total t ON i.word = t.word INNER JOIN node n ON n.nid = i.sid LEFT JOIN node_comment_statistics c ON c.nid = i.sid LEFT JOIN node_counter nc ON nc.nid = i.sid WHERE n.status = 1 AND (i.word = 'hallenbad' OR i.word = 'wörth') AND i.type = 'node' GROUP BY i.type, i.sid HAVING COUNT(*) >= 2) n1 in /var/www/web4/html/modules/search/search.module on line 957.
# user warning: Operand should contain 1 column(s) query: SELECT i.type, i.sid, 5 * (4,51999567535 * SUM(i.score * t.count)) + 5 * POW(2, (GREATEST(MAX(n.created), MAX(n.changed), MAX(c.last_comment_timestamp)) - 1237064127) * 6.43e-8) + 5 * (2.0 - 2.0 / (1.0 + MAX(c.comment_count) * 0,1)) + 5 * (2.0 - 2.0 / (1.0 + MAX(nc.totalcount) * 0,00126422250316)) AS score FROM search_index i INNER JOIN search_total t ON i.word = t.word INNER JOIN node n ON n.nid = i.sid LEFT JOIN node_comment_statistics c ON c.nid = i.sid LEFT JOIN node_counter nc ON nc.nid = i.sid WHERE n.status = 1 AND (i.word = 'hallenbad' OR i.word = 'wörth') AND i.type = 'node' GROUP BY i.type, i.sid HAVING COUNT(*) >= 2 ORDER BY score DESC LIMIT 0, 10 in /var/www/web4/html/modules/search/search.module on line 957

Was bedeutet das, ist das bekannt und wie bekomme ich es weg?

Gruß, Jürgen