The DPL extension (version 2.3.0) produced a SQL statement which lead to a Database error.
The reason may be an internal error of DPL or an error which you made,
especially when using DPL options like titleregexp.
Query text is:
SELECT DISTINCT `page`.page_namespace AS page_namespace,`page`.page_title AS page_title,`page`.page_id AS page_id, `page`.page_title AS sortkey FROM `templatelinks` AS tl, `page` INNER JOIN `categorylinks` AS cl0 ON `page`.page_id=cl0.cl_from AND (cl0.cl_to='Frey') WHERE 1=1 AND `page`.page_namespace IN (0) AND `page`.page_is_redirect=0 AND `page`.page_id=tl.tl_from AND ((tl.tl_namespace=10 AND tl.tl_title='Character')) ORDER BY page_title ASC LIMIT 500 OFFSET 0

Error message is:
Unknown column 'tl.tl_namespace' in 'WHERE'